One of the most worst things that you could ever do to someone. If you're not happy with who you're with, then please leave them. There isn't a use staying around when you don't even feel the same way anymore. Don't think about how much you're going to hurt them, of course it's going to hurt them. But cheating on them, would be worse than just breaking up with them.
When someone cheats on you, never think that there is something wrong with you. It is just them who cannot be contented and do not value relationships. Do not blame yourself about what happened. You can be the most beautiful, but they will still cheat on you. Do not chase them. Please let them Go.
If someone cheats us they do not love us, remember that. They do not care about you as much as they say they do. If someone cheats on you it means that for a split second you were off their mind long enough for them to put another person in their arms that was only for you in the past. If someone cheats on you, I hope you don't go back to them because you are worth so much more than that you think.
If you succeed in cheating someone, Don't think that the person is a fool, Realize that the person trusted you is much more than you deserved.