Do I need to know?

Sorry, I am blowing up the board with questions this morning.
I never suspected my husband of cheating on me until the last month or two. Now reading everything on here and looking back, I suspect there were some other times that he cheated. I have no confirmation of anything. I don't even know if he has someone new. I don't want to know. It is too painful. Is there any reason that I need to know? I feel like it will just make things worse. I prefer to assume that he did cheat and assume that he has someone new but don't feel the need to learn any facts. No contact to me means to not worry about him or any of that. Thoughts?