For a multitude of reasons.
pwBPD are PROFESSIONALS. Getting attention from others, feeling cared about, loved, important is quite literally HOW THEY SURVIVE. It is THAT big of a deal for them. They have such issues with their sense of self, many having very little and even more having NO sense of self, that they must get all of their self worth and validation from others. That means pleasing people... . Don't feel bad. Maybe an analogy will help... .
Imagine you just started working at a bank. A very suave, smooth talking man comes in and engages you at the counter. In the span of 15 minutes, the vault in the back is emptied and gone. No guns are flashed, there is no yelling, you DON'T EVEN KNOW WHAT IS HAPPENING. Would you beat yourself up over it? NO! You aren't trained nor do you have any experience in spotting bank robbers when they aren't carrying around guns. You got fleeced by PROFESSIONALS, who were GOOD.
That is something my therapist told me... . I too asked how my BPDex had managed to penetrate so deep inside me that my emotions and mood and feelings all rested on her and the status of our relationship. My T looked at me and smiled sadly and said very strongly, "She was GOOD".
There are so many pieces to the puzzle here. Many times we fall into the role of wanting to be the one to "rescue" the pwBPD, to save them from the awful things that have often happened to them in their lives. We open up to them completely, give them our loyalty, trust them, all of it. And where "normal" people see that as an incredible show of faith and love, pwBPD take it and run. They use it against us.
I went back to my BPDex many times after she cheated on me. We would reconcile and I would talk with her, explain, set boundaries, etc. I kept going back because she was diagnosed, was in treatment, and was trying to get better. I didn't want to abandon her or give up on her... . and in return for me baring my soul to her, giving her a second, a third, a fourth, a fifth chance, she smiled sweetly, pretended she "got it" this time, and then went and did it all again.
It is hard for us to give up on these people. We love them and it is hard to give up on people you love. It is also hard to believe the things they do. I made use of rationalization, minimalization, and denial in order to stay for as long as I did with my BPDex. The things she did were awful. But I found a way to downplay them so I could justify staying.
What we had for these people is not purely a weakness. It takes great strength to give of yourself, your wants, your needs, in order to help another. There comes a point however where you can give too much, and when you do so you wind up where we all are here now. We were not wrong for wanting to help these people. That is a trait to be admired. We just lost ourselves in the process. But, we are all in this section for a reason; we have finally decided that enough is enough, it is time to focus on US, we are no longer willing to subject ourselves to the abuse of our BPDex's, and that it is time to start living again.
We can only go up
