Hello everyone

,
I've been reading this forum for 4 weeks and decided to write something because I'm not feeling well at all after the break up, he did it out of the blue.
I try to describe my situation briefly and hope that I find people here who can give me advice.
I met my "ex" (33) almost a year ago through our job (both musicians).
We immediately got along well. He was in a relationship at the time and we have had friendly contact (since we both do not live in the same country).
Half a year later we met again because we were traveling together for 2 weeks through our job.
He was still in the relationship but has started to lovebombe me and also said that it is no longer running with his relationship, that they have nothing in common and he's been thinking of breaking up for a few months.
After a few intense days he confessed to me then at some point that he very often thinks of me as soon as we do not see each other for a few hours and he slowly has feelings.
He was also very confused and did not know what to do because he never had so strong feelings for someone, or like he said "i feel like 15 again".
I had at that time already developed feelings for him because it was all very intense (and i just had an eye on him when we first met)
Long story short:
He broke up with his girlfriend on the phone after I got home (they had been together for 10 months, he told me that she wasnt sad on the phone) and he was more sure than ever that I was his "dream girl" and that I was the "love of his life" and that he wanted to be with me.
We have not seen each other for 1 month after the job and have talked every day for hours on the phone and then I finally visited him.
The first 2 weeks were awesome and he was super happy too, but after the 3rd week it got weird.
He became mean in his statements from time to time, didn't understand sarcasm anymore and was very "cold", like a total different person.
When I was back home and we talked on the phone, he started to talk in a robo voice, really cold, and said I had said something that would have hurt him.
But I couldnt remember because that was weeks ago.
5 minutes after he hung up he wrote me "omg I'm sorry for what I said, I don't know why I said that. I am so sorry but my head is empty right now".
I forgave him.
The situation did not get better.
I then learned a lot about him that he has shutdowns, problems with his family, job problems, he thinks too much and he constantly started to complain about everything (food, body hurts, headache, no sleep, traveling), although he constantly said that he does not find it cool when others complain. So he always did the opposite of what he doesn't like in others.
Over time, he started not to write a whole day, smoked a lot of weed or just getting drunk and got really bad hungover and in the evening to act as if it were nothing bad.
When I wanted to talk to him about things, afterwards was completely shutdown and needed time - no matter what it was (and i always talked calm and nice with him). But he wasnt good in conversations.
He also had problems with himself and when you could see that something was wrong he would just say "its okay" or "its fine".
The last 2 months I was so tired of his constant complaining and not talking to me that I didn't eat anymore, I got paranoia that he was hooking up with his ex again or seeing someone else, my friends knew him and whats going on and told me to leave him alone because thats not a healthy relationship.
I had no more energy.
I had 2 important appointments job wise and he knew that and every time he just didn't get back to me on those days or days before he started to pull me down.
The last time was at the beginning of October and when I was back home I asked him on the phone what was going on with him and that I found it disrespectful because I always support him when he has something important at work.
He then said he has a lot of stress etc he is sorry and then he came on with that he feels he can't make me happy.
I then said to him, "you know you can talk to me about anything or just say "hey I have a
PLEASE READty day today I need time for myself" I have never told you this but I love you - just the way you are and i am always there for you".
He was then quiet and just said "I don't know what to say but I think you have more feelings for me than I have for you".
I was so shocked that I started to cry. Days before I was still with him and he did not want a break when I offered him that because he has so much stress and he may need time for himself.
I've been in the NC for 3 weeks and he's written to me twice that he thought of me a lot, he has a lot if
PLEASE READ to process until he is better again and how I'm doing.
I've read so much at the time and I'm sure he has BPD, his 2 sisters also have it and his older brother is autistic.
His mother is also BPD and his childhood was a mess.
On our last call he said he doesnt know what self-love is and since he is 10 he is scared of getting old and to death. I started to cry when he said that.
I'm not fine, I don't know what's real anymore, I feel empty and I don't feel love anymore. I still love him but it feels so weird everything.
I have bad dreams, keep wondering if he's back with his ex. What she has that I don't have - Was it all my fault?
I just wish that someone would open my eyes and I could get out of this nightmare safely... :,(