Should I Worry About My Husband Going to a Concert Alone?

I let my husband go to the Behemoth concert tonight with his friends... It's the first concert he's gone to without me since we met.
He cheated on his ex wife with a girl he met at a concert so even though I know the circumstances of that relationship were very different then ours - I get uncomfortable.. I don't believe in that "once a cheater always a cheater" when it comes to my hubby. His ex wife is a lesbian and made his life a living miserable hell but he didn't want to leave because of their son and the affair sorta gave him the confidence he needed to move on. But the psycho in me says "he ain't never going to a concert without me."
He really can't afford to cheat on me. I own everything. He would walk away from this relationship with a few trash bags of clothes and that's it. Not even a car. It's all in my name.
I think the hormones are making me crazy... I need this kid to come out. I talked to my mom on the phone for like 2 hours. My mom and I don't even get a long that well. I hate not feeling like myself (not that I enjoy having a rocky relationship with my mother). Anybody else feel like their personality has changed being pregnant?
I'm a lonely preggie this evening...