Sorry for English, not my native.

Long story short :

Me 28, her 24. 3 years of LTR ( hell ) with BPD girl, but I never spend any money on her, she bought food, even bought me furniture to my new flat, I never let her walk on myself. There was even physical situation, she was drunk, hit me and got good punch back ( I'm asshole ). She wanted to propose to me and etc. Was really into me, but as You know BPD is fucked up. I lost my frame, she fucked someone else and dumped me. It was in July. In September I was on trip with my buddies and she wrote me. I replied with short messages, but got annoyed and later I blocked her on FB. Then after few weeks I got angry messages to my phone that I never loved her and etc. and she will leave me alone if she is big problem to me. She got new BF by the way. Question - what to do? I believe I can plate her. Maybe somebody has any experience with this situation.