Will guys have other girls on the side because they’re afraid of getting cheated on?

Caught my boyfriend talking to 5 other girls on the side. It usually around the time that we are fighting. He says he does it when he’s afraid he will lose me. He says he doesn’t want to be alone, and need’s reassurance after feeling rejected by me. He cried a lot, and was very vulnerable. I’m not sure what to think?

Will guys have other girls on the side because they’re afraid of getting cheated on?
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