If you meet her ex after many years and you eventually fall in love, that’s cool. Tell her about it before saying ‘I do’ to the guy and she will understand. She will be happy for you and bless you with her advice. But if you are about to make a drunken (or sober) mistake of falling prey to lust, please don’t. The idea of both of you together (naked) will scar her for the rest of her life.