Hi Luannabanana, welcome to PC. I am wondering if your husband is experiencing a mid life crisis and this often does happen when children are in their late teens too. Often part of it is seeing one's late teen children ready to fly off and experiment etc. and thinking about wishing he is able to do that too. It's usually not anything you did but more about him seeing and feeling his age and how he really is getting older and wanting to feel free. It's more about personal discontent and not about you/the wife. Women can experience this as well in their fifties. Mid life crisis is real, a lot of people experience it.

Actually, the movie "Moonstruck" touched on that a lot, some good messages in that movie about life and getting older. It tends to be about fearing age and developing a personal urge to run from it.