Would he normally tell you that he was going out for a bike ride pre-crisis? I would just say "have a nice ride" and leave it at that.
BTW, they do tend to look at us as authority figures, i.e., you are being treated as a mother, so he told mom what he intends to do. Be thankful that he's telling you. Some don't tell us anything and we are walking around in the dark w/flashlights.
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.
