Is it normal to still think about my ex-girlfriend

That was cheating. Definitely cheating.

Should have thought twice before getting drunk at a party with a hot chick, and before 'getting busy' with the said female.
I say you deserve it, and she has the right to dump you.

It ain't easy being a lying, cheating sack of shit. If you can't hold your liquor, boy, then don't drink so much. If you can't control how much you drink, and if once you start drinking you just can't stop then... repeat after me, "hi my name is OP, and I'm an alcoholic".

Being drunk is NEVER an excuse for anything you do, NEVER EVER! Stop feeling sorry for yourself, and start working towards making a change. What if you had been drunk driving and plowed down another motorists or worse a pedestrian? What if a little girl had been walking her collie dog down the street and you killed them? What if you got into an accident with a young man on a motorcycle and he lost one or both of his legs?

Last year, here in Las Vegas, a woman was driving drunk and she hit a grandfather who was walking his baby granddaughter in a stroller down the street. Grandpa died on impact, but the baby survived only because she was tossed in the air at point of impact. That little girl will have to grow up without her grandpa, because some selfish bitch got drunk.

The way see it you're lucky, because yes you cheated, and lost your girl, but haven't you cost anyone their life. If its that hard for you to stay away from a hot chick when you're drunk then you really do have a problem! Now, what are you going to do about it?

"thought my girlfriend would never find out"

Well then you deserve no mercy.

Don't bother crying in your milk. She's gone, and for good reason. Move on and try not to screw it up again.

Dude, you suck.

Did you explain to your GF it's not cheating because she didn't swallow?.