Why not treat him as you would a roommate? Answer questions if he should ask and go about your business as you have been. I do hope that you are using protection because there is no telling if he's been w/someone else. Even though many will swear that they haven't, we find out later that they had been intimate outside the marital relationship.
Sit quietly, the answers will reveal themselves when you least expect them to. The past is gone, the present is a gift and you need to focus on today, allow the future to reveal itself when it is ready.
