Well, of course he's miserable. He's a cuck, what do you expect?
Cucks are just losers who aren't good enough to get a normal relationship. They don't want to admit they're losers, so they pretend they "chose" to become a cuck. But their lies can be disproven with one simple thought experiment: If cucks were offered the chance to be in a regular relationship where their woman respected them and didn't cheat on them, 100% of them would jump at the chance.