I feel like he's cheating.

My husband of 7 years hasn't given me a reason to think he's cheating as of now. Everything is pretty normal but for the past 2 weeks or so I've had this strong gut feeling he's cheating on me. I feel like a crazy woman. I have been a total bitch to him and he asked me why all of the sudden and I told him, he just laughed about it. Idk wth is going on with me.