I’ve had seven boyfriends in three years and none of them have lasted more than a month. What’s wrong with me?

First boyfriend: Had Asperger’s and had never had a friend before. I asked him out because I wanted to show him what it was like to be loved and cared for. I quit him in part because I was getting depressed and being 16 years old, I thought all depressed people were bad in relationships. In retrospect, I probably didn’t like him to begin with, but I did care for him a lot.

Second boyfriend: Asked me out and I felt I had to say yes, otherwise I’d never see him again. This guy weighed 300 pounds and I was never really attracted to him. What really ruined it was he thought he was brilliant when most of the people I knew were much smarter than he was. So of course I broke up with him.

Third boyfriend: I asked him out (he was really cute, fun to be around, and had an international gold medal in math). Then he said he was “bad at relationships” and dumped me. To be fair, that was true - we dated for a month and he’d never even held my hand. But I think he was thinking about something else.

Fourth boyfriend: I met him and we spent a few days having really long personal conversations. I asked him out because he seemed really stable and good for the long haul (his last relationship had lasted five years). Then we didn’t talk for three weeks and when we saw each other we decided we had no actual common interests. So the breakup was mutual.
Fifth boyfriend: I asked him out and then broke up with him because I was worried someone better would come along. Also, I was going into the psych ward and wouldn’t get to see him for at least the length of our relationship.

Sixth boyfriend: On our second meeting I invited him to my place and we had oral sex. Although I wanted to pretend it never happened, he persisted in touching me, so I figured we might as well call it a relationship. I broke up with him two weeks later because our relationship was too physical and he was no fun to be around.

Seventh boyfriend: I really, really liked this guy. We were remarkably similar and could understand each other really well. So eventually I asked him out, only to find he had anger problems (he fought with my mother the first week we were dating). I’m going to break up with him tomorrow.

What’s wrong with me? Why can’t I, for the life of me, sustain a long-term, meaningful relationship?
Oh yeah, and if it’s relevant, I asked out all of these guys (except the first) within a week of meeting them. And four of them had Asperger’s.
Thanks guys