What Guys Said 1
Wait so he asked her for a drink while you were together or he had done that previously and had a more benign comment to her now? I have no tolerance for any degree of infidelity, from myself or a girl, and see it as a major flaw of character. Not the answer you're looking for but I'd just ditch him and not even bring it up. That's just me.
What Girls Said 1
Get it all out in the open and stand your ground.When/if you talk to him about it, don't let the focus be on your snooping. You did something wrong, but it doesn't mean he gets to turn the whole situation onto you. I was in this situation before, and I should have broken up with him for it as soon as possible, but instead I dealt with another full year of being paranoid and catching him over and over again. Whenever we fought about it, he would make ME the bad guy, and that got in the way of me seeing just how douchey HE was. So personally, if it ever happens to me again, I consider it the end. And it's why I hate seeing other women go through the same thing and not know what to do.