Your H will act very much like a young teenager. IMO he is following your lead with the kids a bit like an older sibling would. You are now taking on the role of a parent type figure for him. He may look to you for guidance and probably explains how he reacted with the guy he was friendly with. The main thing is to maintain a steady course and keep the rebellious teenager at bay.
If you try and lead a teenager they may rebel or make it clear they don't need your help. There may be a time for this but it will probably be further down the road.
Enjoy the nice things but as job says keep your guard up and zero expectations. Stick to your path and hold a steady course.
If he follows through with the holiday plans I would go and enjoy yourself regardless. You can have plenty of conversation and fun with the kids if H wants to remain silent.
