Cheating is bad. Everyone agrees on that. I have been cheated on as well and it hurts an awful lot. I didnt see it coming and I broke up with him right away, even though I miss him still.
I find some of the comments here really out of line. Sure I understand you want to revenge and all, but sending sex videos of your ex to their parents is not fair to those parents. They can’t help your ex’s cheating.