9. Say “If you really want to do it, why don’t you go find a fuck buddy?” in a cold tone
“If you say it in a harsh way he should realize what a stupid thing he was doing and this should shake him up.” Because he’s a good friend, your harsh words will help him come back to his senses. After you make that statement, continue being cold and go home. He should come back apologizing and know not to overstep boundaries next time.