Better Not to Know?

So I’ve been reading up on attachment - including a thread here - that states a oidants are more likely to cheat.

I’ve broken up with my ex and in hindsight I was thinking he may have cheated. We were never physically intimate although we cuddled, were affectionate and slept in the same bed and acted like most couples do. I once found a box of condoms that was open and over time it seemed the condoms were getting lower in count. So it was like he was using them and there’s really only one use for condoms.

On the other hand - he is super private and doesn’t like talking to people and thinks flirting and all that is work. He also spent a lot of time texting me if we weren’t together physically so he’d be hard pressed to find the time. He also said he liked porn and watched it ‘regularly’. And he mentioned that his ex cheated on him and that really did a number on him so I’d like to think he knows what hats like.

I want to ask him if he was unfaithful but is it better to just not know? Leave it alone and get in with the healing and moving on process?