Relationship postmortem

The guy I turn in to in relationships is an asshole. I hate that guy.
It seems like he's always jealous, overly controlling, pushy, insecure, and complains a lot.

Perhaps that's because I've been getting myself in to unhealthy relationships? Blleehh, maybe I just get bored super fast? Are there deeper underlying problems? Am I over thinking things?
It's interesting the patterns I've started to notice about the girls I am generally attracted to. I wonder if that's because I like those kinds of traits/aspects in girls, because I search for those traits/aspects, or if it's chance...
It's hard for me to believe that it's chance though, 4 or 5 times is difficult to call random...