<human>: I'll try to keep this as short as possible. 

Been with my (now) ex-boyfriend for three years. He's abusive, neglectful and just all around horrible. He's been like this for nearly 2 1/2 years and I don't know why I stayed with him. Maybe it was the feeling of being in love and looking past it, I don't know. He has destroyed who I was and molded me into something I don't like. I'm depressed (taking medications) and I've developed irrational fears of the most harmless stuff. 

And yet, I can't get him out of my head. I'm terrified of letting him go. He always calls and texts, which I'm stupid enough to answer. I've never really handled break ups well and I don't know how I'm supposed to really get past this in a healthy way.

I'm trying hard to keep away. Especially after tonight, he slapped me across the face hard enough to draw blood from my lip. It feels tingly and I worry it'll be a fat lip in the morning. 

I don't know what to do at all.. He's stuck in my head and I'm being driven crazy over someone who obviously never deserved me from day one.

Summarize the given text in a few sentences.
<bot>: Abusive ex-boyfriend, can't get him out of my head. Need advice on getting over break up.