People Constantly Leave Me?

My third relationship of the year ended yesterday. I always date online, I don't have any other option. But I feel like I treat this people pretty well, and there shouldn't be a reason they'd end it or just up and leave... Could it be that I get pretty invested and serious about them quickly? Or my mental issues? Or that I have a poor personality and I'm fat? I'm just tired of this and its starting to make me dislike myself ): People always tell me to just stop trying and work on myself, but for me, working on myself with someone beside me to love me isn't imaginable...
People Constantly Leave Me?
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