He's done the wrong thing. It's been cr ap for ages. This will either be the catalyst for things to get better or the catalyst for things to end. I would recomend marraige counselling. People think counselling is all about saving the marriage - it's not. It's about seeing if there is indeed a marriage to be saved first. It will completely become apparent whether it can be saved or not, and you will then be able to part knowing and not carrying any regrets. Or, you will discover that through maybe poor communication or whatever that your marriage is something you both want to save.
I wish you the best of luck.