He cheated on me with an engaged girl, should I tell the fiancee? P. S he lives out of town?

My boyfriend (now ex) cheated on me with a girl who is engaged, the girl's fiancee has never trusted his girl around my ex because of how they acted, as i didn`t trusted any of them either.
anyway i just found out he cheated with her.
would you tell her fiancee? or should I leave things as they are?
He cheated on me with an engaged girl, should I tell the fiancee? P. S he lives out of town?
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