Marriage help

Ever heard of fresh&fit podcast? My husband watches them and ever since then..My husband has voiced that he wants to step out once in a blue moon. Obviously that idea is just sickening to me. He sees things as he pays the main bills. The mortgage the cars the insurance etc the hefty payments. I pay the little bills water light etc nothing more than 200. I know I’m a difficult wife. I nag probably more than I should and probably ask for more than I should. I don’t enjoy giving him a BJ and I’m wondering if maybe the lack of sex and not doing what he tells me to do without a “fight” is why he’s wanting to step out. Am I wrong? I know we all have our bad days and it may affect our relationship. I feel he doesn’t pour into my cup as much as I need. I love him to death and I can never pull myself to leaving him. The other night I found three condoms in his car. And I felt numb. I didn’t feel sad mad nothing. I also don’t want to mention it to him. I feel it will get no where. But in his phone there’s nothing he is hiding. I’m not sure what to do. Idk if I should even bring the condoms up to him. Or ask him what I can do to be a better wife to him for him to stay within the marriage.