I enjoy cheating on my girlfriend a lot.
That's awful, why are you cheating on her?
Because it makes her sad, and I like seeing her sad, for some reason.
You shouldn't cheat on your girlfriend. It hurts her and she will break up with you. Either break up with her or be monogamous.
I'm going to cheat on her again. We were on a break :-).
This sounds like a downright abusive relationship. You are cheating on her repeatedly because you know she'll let you get away with it. That makes you a bad, abusive boyfriend that needs to get help.