Your friend was right: being honest was the right thing. Doing the right thing doesn't always mean you get what want, like getting away with cheating. It sounds like if you could, you would go back in time and be dishonest with your gf instead. It makes you scum. You cheated. This is the consequence. You deserved it. End of story. Don't act like your friend gave you bad advice. And maybe if you took 100 percent responsibility instead of telling your gf you cheated "accidentally" then maybe it wouldn't have ended this way. But honestly, I don't see any other way it could've.

You weren't entitled to a second chance at all and I don't understand why you thought being honest to her was her privilege? That said, it was a drunken kiss, if you two really loved each other, your relationship would have survived this.

Putting accidental in quotes kind of insinuates guilt.

Accidentally? Did you slip on something?

I hate to break it to you, but what you do when you're drunk is what you thought about doing when sober.

Telling the truth was the right thing to do. However, you get no sympathy for what you did. This wasn't an accident, people who cheat while drinking are often the ones who have entertained the idea while sober, alcohol is NEVER an excuse. It isn't an excuse to drink and drive, it isn't an excuse to be a cheating asshole, you can usually still control yourself, and if you can't, well don't drink, it isn't something that's needed.

Your friend gave you the right advice and you are looking for sympathy in the wrong place.

Everyday, your a wanker who deserved nothing less. You should come with a warning for the next girl.

You say "accidentally" almost like you intend it; at least that's the context I'm getting from it. Bro, of course she's going to break up with you. How would you feel if she got wasted and made out with some guy you don't know? And if you're at the point where you can't control yourself enough to not cheat on your gf, maybe this is a wakeup call to tone down the drinking

What did you think she's going to say? It's okay? Alcohol does not justify your actions.