Unfortunately, some people cheat on their significant others. Obviously, it's not a very good thing to do to someone you love. In fact, it's pretty downright rotten. There isn't a best-case scenario when it comes to partners being unfaithful.
I guess the best you can hope for is a story that's at least somewhat funny and maybe a little vindicating.
A recent AskReddit thread asked people to share the most ridiculous reasons people's partners had given for cheating on them. Now, I'm pretty sure there's no such thing as a good reason to cheat on someone. However, there are plenty of totally bonkers, ridiculous, wackadoo reasons that people have given. Some will make you laugh out loud; others will make your blood boil.
I hope you're never on the receiving end of a message like this, but if you are, I hope you can at least laugh about it. Eventually.