Is this normal?

Been with my husband for almost 8 years married for 9 months. Recently I asked a question that I am pretty sure we discussed before (more than once). He gave me the same answer I believe he gave me the other times so I thought nothing of it. Until he later woke me out of a dead sleep because he felt guilty for lying and couldn't handle it. He claims we've never had this discussion so he panicked and lied. WHY AM I DWELLING ON THIS SO MUCH. I love my husband and the information he told me happened before me so it's not like he cheated or did anything to disrespect me (other than lying at the moment... 🤔) But the info he told me keeps replaying in my head at obnoxious times and I just feel like all the information wasn't given. But like I said it happened before me.. so it should not matter to me. But I just don't get why I have to dwell on it. Is this normal? I'm annoyed with him and myself at this point.