Do most guys do this?

I was messaging a guy that I use to work with. He had reacted to a picture I posted on Facebook and messaged me saying I was “fine” and the conversation turned into us going out for the weekend and he made a sexual comment but I didn’t take it too seriously. The weekend came and he just stopped sending messages and I did the same and now today he posted on his story a picture of a girl in bed with lingerie laying over his leg and they looked like they were chilling, smoking watching anime etc which is fine but what do guys get out of entertaining other women if they have a woman already?

Do most guys do this?
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