I'm bi, and I'm always up for bi representation, but why the prince gotta be a cheater? Because that's what he is. They play it off for a laugh because the protagonist herself isn't in love with him, but the fact of the matter is, he cheated on his wife. If they had established that it is common for people to continue sleeping with others after marriage, or that open marriages are the norm, that would be a different story. But from the way they reacted to her finding out about their trysts, it's clear that even they know what they were doing is wrong. It is. It's cheating. I already did not like the male lead, and I don't like him even more.