What would YOU do if you were in my shoes..

Ok so the skinny is: I met this great guy.. we've been dating steady since the end of May & he asked me to be girlfriend in June so now it's been over a month since we've been "official." The problem is he texted me this morning because last night, at his friend's bachelor party, he slept with a stripper. HE WAS SOBER. AND THE STRIPPER HAPPENS TO BE HIS EX GF. He also told me that the sex they had last night "might have meant something" and now he can't choose between me or her. I DO NOT want to be told "dump him" please- I have enough friends to tell me that.. I need some outsider's opinions on what to do. thanks.