I cheated.

[Mayhem]

He already mentioned that he told his girlfriend about it. I could see why she's mad though.

And:

If she breaks up with her

What?

I don't think I read anything about Lesbian action in the first post lol.

All jokes aside, what is going to happen between you and girl #2 now? If that was just a phase, then you should really think about what you just did, and was it worth it? No one should be hurt in that kind of way. Love is for loyalty.

Talk to girl #2 in private about the situation and see the way she feels about the situation, and what happened. But don't put the blame on anyone else but yourself for this. There is a thing called self control.

Lastly, try being sincere, send your "girlfriend" some flowers. Do things for her to show that you really do care. Things that you normally wouldn't do so that you can get her approval of your "apology" and hopefully things work out from there. If you get back on track again, things should settle out as long as you promise your loyalty to her, and you'll have a stronger bond than before. (Just basic laws of human nature and philosophy)

You're going to really have to pull yourself together though. Try sending her flowers, giving her calls (if she doesn't answer, leave a voice-mail. Don't be pushy, but be persistent, in that you want to talk it over with her. If that time comes, be as open as you can with her, take the blame for what you did, recognize her side of the story and think about how she's feeling. Make a promise to her that you'll never do it again (whether she believes you or not, you have to believe in what you say for your own self as well).

In the end, you still need to talk about it. That's your only connection with her right now, and communication is key. Be completely open with her if you get that chance person to person.

Ace is right, his advice is best. Communication is the key dude. If you want her back, make sure you make it clear you're taking full blame on this. That she's the only one for you. Show her you love her. Ace basically put down everything you need to do. Good Luck!