Why would a guy, only keep you around just for sex when he has the potential of actually getting him a girlfriend?

So, like say, for the guy he's not Okay with you having other sex partners or maybe you start to date someone. But he also has other options too. And if you want out of the friends with benefits zone or maybe despise decides that you wanted to date someone. He seems to respect your decision and your choice. I do think and believe that it is possible to Transformer from friends with benefits to being just friends. But you guys definitely, have to fight the urges and act strictly just friends, if both really do want that. But anyways, I was reading some articles and stuff online, about how a man will keep a woman around just for the sex. Like, he will wait until she gets out of a relationship or when she gives him the green light. And to me, that's absolutely crazy, but it's like. Well this person who is keeping you around for the benefit. They can actually have the potential to actually meet a really good girl. And. I am sure, they talked to plenty of girls, but just because a woman's vagina is that good to man. I mean, he shouldn't keep it around, especially if he's not trying to cuff and commit. Any thoughts and opinions?
Why would a guy, only keep you around just for sex when he has the potential of actually getting him a girlfriend?
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