I found out my fiancee has been cheating on me for quite some

You don't have to tell them anything. They'll figure it out when you aren't around anymore and if they really care about you, they'll be disappointed in their daughter for awhile. Telling them yourself is petty. If you're vindictive at all about your relationship, just avoid her parents because it's not your place to talk to them about this.

>>17971343
Unless the chick in the kind of person to lie to her parents about the reason for them not getting married anymore in a way that paints him as the bad guy. If he wants her parents to still think highly of him, he should come clean with them.

>>17971499
If he's as important to them as they are to him, then they won't blindly accept what she tells them without hearing his side of the story first.

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>>17971329
Weeellllll that is a quandary. I would try and swallow your anger at your Ex as best you can , so you can continue a relationship with her parents which clearly means a lot. I would tell them that.

>>17971499
Doesn't usually work that way. Especially in a society when men propose to women. When people are set to be married, I'd wager it highly unusual that the man being unfaithful is the reason for calling it off. He wouldn't have proposed to begin with.