Cheating doesn't only mean that you have another one while you are in a relationship. When you still entertain someone flirting you on Facebook, that's cheating. When you say that you are single to other people that's cheating. When you still entertain someone even if you were told not to, you are actually cheating. When you continually exchange messages with someone, that's actually cheating. If you still stalk other girls on social media, that's cheating. No matter how small you think it is, that is still cheating. Stay loyal when in a relationship, leave if you can't.