Suspicions of BF cheating, for no reason. I feel SO crazy.

Me and my bf have been together for over two years and have a 9 month old son. We’ve pretty much lived together since the beginning of our relationship until 3 months ago. We had to move out of our rental house and currently are living separately until our new home is move-in ready.

We’ve always had great trust in each other. And I’ve never done the whole checking his phone and stuff. EVER. Never have felt the need to. Until I had a suspicion which is a long story I won’t go into, and saw he still had texts from his ex from when they were together and broke up and found out he was sleeping with her while we were talking and telling her that we were nothing but friends when we were more. He still had her nudes and pics and videos of them having sex and some of her masturbating.

I was able to forgive him and never went through his phone again. And I don’t have any super specific reasons to feel that he’s cheating on me... but I just feel something off. We used to be crazy sexual and have mind-blowing sex multiple times daily even after the baby. But now he barely asks for it, and when we do it’s almost impossible for him to get off. (Though he’s on Lexapro and says that’s why) but the problem occurred BEFORE taking Lexapro...

He also seems to be withdrawing himself from me almost. I just feel hes lost interest in me. He barely talks to me, and there’s just things that seem off. He takes longer to get home from work. And I can’t help but feel that it all adds up to him having someone else.

And I feel that someone else is his ex I mentioned earlier because none of this started happening until she moved back from out of state and moved right down the road from us....

I have no physical evidence or solid reasoning for feeling this way but I DONT want to. I don’t wanna feel crazy. We had a good thing and had good trust. I don’t want to ruin it but I can’t help how I feel. How do I get through this?