That cop was obviously kinda stupid. Really wrong for him to tell your bf to stay away from you. Seriously! I'm sorry. I mean, i'm not a doc and i don't really know you, but if your therapist says you don't have BPD, then maybe you should just believe him/ her. Just don't let that bother you. Its a little thing.
In my opinion, you really shouldn't take anything someone says to heart unless they actually know you. If they care about you, they'd help you fix it. Like if a girl friend tells you, you dont look good in that color, then they should tell you what you DO look good in. Get it? So your bf is a jerk. simple. Anyone that cares about you wouldn't just leave you like that. My ex had BPD and i loved him so much, all i wanted to do was help him. Take this to heart. maybe there's nothing wrong with you, you just have bad experiences and you have issues dealing with them. (Its ok because pretty much everyone does). Just try and find ways to keep yourself calm and be positive. Your past doesn't define you!!!