Why do some guys always have to have a girlfriend?

Anonymous
What I mean is where a guy has a girlfriend, then they break up and he starts to like someone else, and then by the time the girl realizes that he likes her and is wanting to go out (even if it hasn't been a long stretch of time), he will have since hooked up with someone else and has a new girlfriend. Are guys not as selective?

This happened to me, and of course I was very confused asd a result. Actually this guy and myself met when he already had a girlfriend, but was flirting with me. They broke up and we started getting along better. So it seemed going out was the next step. He was making it more obvious that he likes me, and he knows I like him cause I told him, and then I find out that he since hooked up with someone else, although now I am getting more attention than ever from this guy.

I don't understand why guys do this, and actually it is a turn-off to be in this position. I would still like to understand it though.
Why do some guys always have to have a girlfriend?
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