He knew what she had done and was waiting to see if you were going to confront him about it. Bide your time....you will get your opportunity to share your knowledge w/him.
T, they all act like this when they've been caught w/their hand in the cookie jar and just know that "mom" is going to talk to them about their misbehavior.
Don't worry about his attitude...it sucks and he'll get over it. You continue doing what you've been doing because it's not about you at all.
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.
