I have never cheated on someone who I have been involved with. If you are in a relationship with someone you care about this would be the worst thing you could do. Even if you are having problems and are very tempted to cheat because you are hurt, it is not right. Talk to your mate. If you can't work out your problems break up. Don't cheat while you are commited to someone. It lessens you and makes you a cheater. There is no reason to be that kind of person. Good luck.