break up after manipulartion and still he's being manipulated

[Hedgeh0g]

I recently got together with my best friend who has BPD when we were just friends I could always make him see sense at one point he was talking about us living together and making a full commitment but a 'friend' manipulated both of us and played us off against each other which he does now know but where in the past finding out he'd been manipulated to prevent him doing something he wanted to do would have made him dig his heels in and be more determined to do it it's had the opposite effect he now says he wants to remain single for the rest of his life. He was meant to be moving to a flat near me but out of the blue a couple of days beforehand he got a call offering him a room in a shared house he'd already been turned down for but the reasons they turned him down still exist (his work hours). He claimed he wanted us to go back to being best friends as he cared about me too much to lose me from his life which I've tried to do but he isn't even meeting me halfway. The 'friend' who meddled keeps messing with his head and making his BPD worse. Whenever he has made the suggestion to come over to mine at the last minute something always comes up usually something to do with so--called 'friends kids (they're not his). She's also encouraging him to see other women in a social setting but he's adamant they're not dates. He knows I have some problems including severe PTSD which in the past he's always been supportive of now he acts as if only his mental health is a problem because of things she's said to him-he accidently let it slip on the phone. I'm at the point where I really can't take anymore and don't know what to do