Tell him he can love you and love the other guy at the same time.
“There is no settling down without some settling for.”
“Loyalty isn’t something we demonstrate with our genitals alone.”
“Honor the commitment you made by keeping your mouth shut.”
“We showed them — we showed those motherfuckers — that the fight in us was greater than the hate in them.”
“He may have told you there’s nothing sexual about his thing for diapers because he thinks it makes his diapers seem less sordid.”
“She’ll probably guess what you have to tell her before you get the words out.”
“A couple that met in a sex dungeon will say they met doing a team-building exercise at a work retreat.”
It would be simpler if you sidestepped the issue by not speaking about your asshole ex ever again.