Don't analyze, because you can't read his mind. I say don't turn cold on him, but also recognize that he may be just staying with something familiar for comfort. Sailing lessons? Hmmmmm. Did he just experience some sort of upheaval, like a crisis, death of someone close, or something? Sounds like it may be depression mixed with MLC possibly. Maybe not. Either way, it's out of your control.
Did you notice how small the list of things you should worry about became?
