Hi guys, first post here. A little background. Me (22 male) and my uBPDexgf (21) were together for 4+ years. In December I found out she had been cheating on me and looking for a replacement. She had made a tinder account (dating app) in early August) and I guess was desperately searching for my replacement which she eventually found.
My replacement and her were going out for what I think was 3 months before she went public with him after 3 weeks of dumping me. She tried to make it seem as if she had met this guy in the 3 weeks we were on "break". During the break she was emailing me, as I was blocked, telling me she would take me back in a heartbeat if I just showed I cared when all along she has this guy in the background.
I eventually find out while I'm trying to prove my love for her and begging her to take me back. The reason she had broken up with me and caused the break was because I had looked at girls, girls I didn't know, model pages, etc on instagram. Ridiculous, I know but she was incredibly insecure. So she dumped me and tried stringing me along while she tried to make things official with my replacement which eventually happened. They're still together.
This is where things confused me. Ever since the day I found out and confronted her over the phone where she denied everything despite the proof that I sent her and I told her some nasty things (which I regret) she had been trying to contact me every week. She contacted me as unknown to get around my block one week after by calling me very late at night at 1:30am. She left a message, crying (playing the victim?) saying she was sorry, how she wasn't calling for me to take her back (what ), and that she realizes what she did was wrong. She continued to say that she cared (is that a joke?) and to not think she didn't and that she hoped I was doing okay. She then called a few days later on the day that would have been our 4 year anniversary, again at 1:30am. I never answered any of her calls.
That same day of our anniversary date she decided to start her smear campaign on her tumblr. She posted all these nasty lies she started comparing me to my replacement and how he changed for her when I never did. 3 months in and she's already trying to change the guy.

She even said things like how she didn't even like him at first because he said the wrong things but eventually he changed. She talked about how she deserved to be treated like a princess that she is and how she deserved to feel beautiful (the entitlement!). She even said she wasted her education on me when she came back from her university in another state. I actually had thought for 2 years that she came back for me but that was a lie, she came back because she was kicked out for possession of marijuana (caught twice). Does she actually believe her lies? She even made sure to mention how shes already in love with this guy and how great the sex is. Her instagram was her parading this new guy. Post after post after post of him and her together, about how happy she is, the happiest she has ever been, how he opens the car door for her every time (this one made me laugh). No shame whatsoever. Honestly, what do her family and friends think of her having a new boyfriend 3 weeks after we broke up.
As the weeks passed by, she was still calling me every Saturday morning at 1:30am exactly. To the dot, it was scary. She never left a message and would sometimes call multiple times. This continued for 6 weeks. One week she noticed that she wasn't blocked anymore as I had deleted her contact, this is when she decided to send me a nice little text message blaming everything on me. How I never listened to her about not looking at girls. (She had forced me to promise on many occasions to not look at porn, look at girls on instagram or the internet and to not even check out girls in real life!). In her words, I never gave her the attention or affection that she needed. I had been seeing her almost every day in between my work and full time school schedule and it still wasn't enough! I even saw her every day of the week on some occasions. As for the affection, I had been with her for more than 4 years, I gave her all the affection I could, sure it wasn't the honeymoon phase but I loved her and made sure she knew that but it wasn't enough. I would compliment her on occasion and even that wouldn't be enough. She would reply with "that's all you have to say?" or "that's it?" and she would get angry or sad. God forbid I used the word "cute"... .she hated it.
The calls continued until about a month ago. She decided to wait for me outside of my classroom and follow me. As she approached me I began to have an anxiety attack. She said that we needed to talk. I told her we had nothing to talk about. She insisted there was more than I knew or thought. I told her that all she wanted to do was blame me but she denied that. I replied to her by saying I knew all I needed to know. She kept pleading that we needed to talk and I just ignored her and eventually lost her. She had been following me for a good few minutes.
That same night she stalked me, she called at 11 and then again at 1:30am. Of course I didn't answer. The next morning I decided to send her a text message (bad idea). I told her that she needed to stop calling me or that I would report her. I got sucked in at this point. She that we both needed closure. LOL, what does she need closure for? I'm assuming she meant "I need to unload my guilt on you so I don't feel as bad". I told her that I don't need closure and that she needed to just let me move on as she already had. She said she wasn't over it, she hadn't moved on. She even said she still had love for me! . I insisted that she leave me alone, that she wanted me out of her life so I was giving her what she wanted. She then had the nerve to say she didn't want me out of her life, that I was her best friend. Apparently best friends cheat, lie, manipulate, and discard each other. She just wanted me to be a fall back plan, right? I told her how there was no excuse for what she did to me and that normal people talk about their issues or break up, not cheat. She said that she did talk to me, if you count crying and threatening to leave me if I don't stop using instagram as a "talk". I eventually said something along the lines of "bye im blocking you" ans she decided to reply by saying she didn't have sex with my replacement until the day after I broke it off. I never broke anything off, she did . Either way, it's as if she was proud of that, as if she didn't think she was a cheater because she didn't have sex with him till after we were broken up! I blocked her at this point.
Later on in the night that day she sends me a text through her cousins phone saying how I was right, that she needed to move on. Said she was sorry for lying and manipulating me (literally just that). She didn't apologize for cheating or anything else, just a simple, non-sincere "sorry". Again telling me she had love for me (whatever that means). She said she wished me the best in finding happiness with someone else like she had with my replacement. That he loved her. Almost as if she wanted to hurt me on her way out by saying that.
My reply to her was sarcastic. I laughed at her, telling her to save the BS, that you don't cheat on someone you love and leave them for another person. I also told her that I thought it was funny how I couldn't look at girls on the internet but it was okay for her to talk to guys behind my back our entire relationship. I found out after through her ex best friend who she also painted black that my ex basically had all these orbiters, guys she would talk to and sometimes even go out with! I never would have known. This whole time I was actually feeling a little guilty for not stopping the porn watching and Instagram but after finding that out I was relieved. Told her that happiness comes from within, not other people and how she needs to realize that she is the problem and not everyone else that she blamed. Something I also added was that I did truly love her, something I had always told her until she showed her true colors. This was in response to her smear campaign where she said I never cared about her or gave a S*** about her. I guess she had to justify her decision to replace me.
Funny enough, after I told her that I knew about her orbiters she fired off a nice text message to the ex best friend saying ":)id you tell ta777 about the S*** I did?". Oh man. She almost fooled me into believe it was all my fault. She had always been a hypocrite with her double standards. Not letting me go out with coworkers but she was able to go out whenever. Her always looking through my phone every day looking for dirt when she was the one talking to guys and cheating on me. (Projection?) The day I decided to look through her phone she took it away from me and didn't let me. I told her I was going to leave her house and she started to beg me on the floor, crying for me not to leave. I thought that was childish but now I realize why. I had triggered her fear of abandonment because she knew if I saw her phone I would dump her for being a cheater. She was probably talking to my replacement as this had been in October. I don't know what happened after that but she ended up manipulating me and I forgot all about it. She got away with it.
Point is, I gave her all I could and it still wasn't enough. We would text all day, every day. Talk on the phone almost every night. See each other at school because we went to the same one. I would hang out at her house all day. Nope, wasn't enough attention apparently. I had isolated myself away from my family, friends, coworkers because there were girls and I never realized it because I was too busy trying to please her. Now that I'm out of the fog I can see things more clearly. I'm not wrong to believe she is a pwBPD am I? What was up with her on the dot phone calls every 7 days? Why didn't she ever leave a message and did I anger her by not answering her calls?

I'm assuming that all she wanted to do was blame me to relieve her guilt and I wasn't allowing it.
Sorry for my long rant, I needed to vent it out to an audience that can understand what it is like with a pwBPD. Thanks BPDFam!
EDIT: I realize that I'm not quite sure she replaced me because of me never stopping looking at girls. She started her search in early August. We didn't have our fight over instagram until October. Makes me wonder why she needed to leave me. Weird that She started to let me use instagram again after being banned from it by her in August as well. Almost as if she knew I would "screw up" and she would catch me and have a reason to replace me. She was looking through my phone daily during these months looking for something.