Is he cheating?

We usually are at my house but tonight we were eating dinner at his house and he says to me "did you leave a piece of jewelry here last time you were here?" I said "no" (considering I hadn't been there in over a week) . Then changed my mind and said "well what kind of jewelry" and he said "nevermind then " . Later on throughout the night I saw the bracelet on the coffee table (definitely wasn't mine ) . And I also have to pass his house in order to get to mine and last night around 11:00 pm, his babymamas car was in his driveway.

Which 11 at night is a little late don't you think? I don't cAre if you have a child together, pickup/dropoff the child and go back to your house at a decent hour.