I've got with people other than my gf, but I've only cheated on her once-if that makes sense lol. We're in sort of an open relationship.
She doesn't mind if when I'm drunk I get with other people so long as I tell her because she knows I don't love THEM. I don't do it anymore though, out of respect to her and because I don't have any inclination to anymore.
But the last time it was with her best friend and I feel like the most heinous horrible perosn for doing it. She was REALLY flirting with me and I know thats not an excuse. It was ONE kiss and I feel terrible just thinking about it...