Does this mean he’s sleeping with someone else?

When you’re texting a guy and he can’t text you back one night or for a couple of days. He gives you a reason like he’s with his friends or something. Does this mean he’s sleeping with someone else?

The only reason I think this way is because my ex used to do that and I’ve realised a lot of girls have had that kind of experience.

Am I looking into it too much or is that the case?
Does this mean he’s sleeping with someone else?
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