If i was in place of that guy i wouldn't have gotten drunk with another girl. and kiss? never. i mean, it's just not right to do so when you have a girlfriend.
but if you look at it the other way round, he's been honest to you. he told you about it and moreover he regrets it. he was drunk too, so maybe he didn't know what he was doing. in my opinion, give him another chance. but show him how wrong he's been. and if he does it next time, then no questions. dump him straightaway.
When you came back to me, it was the most beautiful moment for my soul. I love you for the rest of my life, my love. I am bound to be yours forever, like I always was...[SIGPIC][/SIGPIC]