My friend with BPD confided in me that I was his favorite person a few months ago. We would talk everyday for hours and I have really tried my best to be there for him, be a good friend  and be a shoulder to cry/lean on. I had to take a week to study for my MCAT. I communicated that I would be busy studying and would be focused on school. I told him if you needed ANYTHING CALL ME!!! I would check in to make sure he was ok during the week but I ultimately was focused on my studies.

In that week of us not talking  he met a girl and they started dating suddenly because they bonded over having the same childhood trauma. Immediately, our conversations have diminished. We go days without talking or when we do talk it’s brief. My text messages go unanswered and it’s really annoying! When his girlfriend is busy or if they get into a fight, he will call me and expect to talk to me as if we haven’t talked in weeks. 

I brought up that I felt as though our friendship has changed now that he is in a relationship and he invalidated my feelings and said I was overreacting and was jealous of his girlfriend. How do you meet someone and immediately switch up like that? I feel as though he used me until the next best thing came along. 

I’ve become accustomed to talking to him everyday so it’s honestly weird not talking to him. If this was a friend without BPD I would’ve blocked them and moved on because I feel as though I communicated my feelings and he doesn’t care.I know that he fears abandonment and I don’t want to trigger any past trauma so I think that’s the only reason I haven’t done that. 

Just recently, I was telling him how I feel as though our friendship still isn’t where it use to be. He then replied that we aren’t friends outside of church. Which is weird and random because before getting a girlfriend he was always telling me how we are best friends, how he enjoyed having me in his life.

I feel like he used me for emotional stability until he found the next best thing. It just seems like he doesn’t care, probably never did. I scared to tell him I don’t want to be friends anymore if he continues to be a jerk. I feel like pwBPD deserve friends to I have tried to being patient and considerate of their feelings but he hasn’t done the same.

I don’t know what to do and was looking for guidance. Can pwBPD not maintain healthy friendship? How does one fear abandonment but quickly abandons others? Am I overreacting? 
Should I stay?  PLEASE HELP!!!!!