Five ways to trap your boyfriend into revealing that he's cheating on you, and why they are dumb

Ushikubo suggests five traps you can lay for your unsuspecting man, explaining how the guy’s response will show whether he’s cheating on you or not.
Good guy: Changes the subject because he doesn’t really care who watched what with who.
Good guy: Doesn’t try to take it off you.
If he’s cheating on you, though, he’s probably quite a good liar.
Cheater: Agrees with you and sympathises with the cheating guy.