Moving past things

My husband has cheated in the past and I told myself I’d try my best to keep our family together. The problem is I can’t help but always feel like something is up. I’m having panic attacks at night from trying not to look at his phone and find things. It’s literally consuming all of my thoughts. I want to trust him and move on but unless I look and see nothing there I always feel like he’s being sneaky again. Like even tonight, he came home from work and was acting distant, it immediately made me worry. Then he wanted to have sex which isn’t like him especially after a long day but I couldn’t shake that it was to cover up something. We have been fighting about his lack of wanting sex so it might be that he is trying harder to please me but my mind completely flips it around to something bad.