Cautiously optimistic

[~¤DG¤~]

Well...a minor setback happened today. A mutual friend of ours told me she saw him out on Sat night at a bar and he was with some women, and of course I flipped out. I asked him why he didn't tell me he was out with women and he's making me look like an idiot and he got really mad.
He told me that he was with coworkers and he can't believe I would think he would go and do something behind my back. He was really angry.
I guess I really don't blame him for being upset, I didn't ask him about anything I basically accused him of being out with other women.
He said yes, he does have some coworkers who are women and yes he went out for a drink but he wasn't doing anything wrong.

I feel so torn. I want to believe him, he's never been a dishonest man and if he was going to mess around he probably wouldn't do it in the town where we both live...but I don't know. Am I being stupid? On one hand I think "no way, he loves me." But then the other part of me thinks about how he has told me he can't say if he wants to commit to our marriage or not. He says he Is afraid to say it because he doesn't want things to go back to how they were. I just don't know what to think.

My best friend thinks I am being a moron for waiting trying to work this out. Am I a moron?