What makes people pursue relationships they don’t want to be in?

Asking because I’ve had a lot of relationships where I met a guy and he was quick to make it official, insisted on me meeting his mama, meeting his friends. I sort of go along with it, then some time later I find that he has been cheating on me or something along those lines. I just don’t get why, a lot of the time I am really open to the idea of being in an open relationship with the guy but he would reject this and make out the relationship be something it isn’t just to do me dirty later. It is like guys like leading me on for no reason. Why would someone do something like that?
What makes people pursue relationships they don’t want to be in?
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