How did you react when your partner was unfaithful?

Just want to hear some stories.

A story from a few years ago.

My ex went to a party and I found out a couple of days later he kissed another girl, who happened to be a good friend... I was so angry. I wasn't going to leave him for a kiss though. But neither could i leave it be.

So the next day, while he was out, I went onto his Xbox and ended up overwriting every single saved game with my own. I mean he had spent every night playing at least one game so you're talking like hundreds of hours of game play possibly thousands over 10-20 games. I am an avid gamer myself so I know how gutting it is when you feel that time was wasted. A couple of years later apparently that didn't teach him and he ended up kissing another girl and was even offered sex which by the texts I saw he considered.... There is a reason he is now my ex. Fool me once right?