Because it's a pretty common troll you see on Reddit. Also comes in the Asian man variant where you replace the black 'bull' with a white dude.

You are going to have to try and exert some control over the phone use. Maybe try that tree app that locks your phone for two hours? Bit of gamification might be what he needs.

Worst case, he needs therapy.

Don't sleep with another guy if you don't want to