What do you think?

Two years is a LONG time to be living in this mental state.

It's like accidentally tripping and having your hand land in a super hot deep fryer at work. And two years later, asking others if you should remove said hand from the deep fryer. And without much context, no one here can really tell you if you should stay or leave your current partner.

But think about it. Complacency/status quo in a relationship isn't a legitimate reason to remain in a constant state of paranoia and anxiety. But then again, NO ONE HERE knows who you are and if your anxiety and paranoia existed before this relationship.

1. Let's hypothetically give him the benefit of the doubt and say he's gone straight and not cheating on you. I'm certain your relationship is kind of poisoned by your paranoid toxicity.

2. Let's flip it and assume he's a cheating bastard. You ain't going to fix him this late in the game.

Both scenarios, the only path is to break up with him. Or you get some medical help/therapy to address your anxiety if you still actually believe in scenario 1 (mentioned above).