I'm sick of being messed around, am I doing something wrong?

Each boy I like or date ends up with me being broken hearted. I keep trying and ex's say they regret breaking up with me but that's not the point. I'm so sick of just being the one who always loses. I'm not the type to just date around, I actually enjoy relationships. I currently like this boy who has a girlfriend (yes I know, it's wrong) and he tells me he likes me but I don't know if he's being genuine or just doing it for the thrill of having two girls. What do I do? Am I doing something wrong? Please help me!
I'm sick of being messed around, am I doing something wrong?
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