Continue to focus on you and work on yourself. Yes, he's going to say things and then not follow through. Some will say things that they think you want to hear. Others will say, I'm working on the relationship, blah, blah, blah, and haven't moved an inch in effort. They are depressed and time is very, very slow for them.
Rise above his nonsense. I know that you are tempted to send a letter to his work, but what would it gain? Nothing because they will stick together no matter what for the time being. It is best to allow this mess to burn a slow and final death on its own. Oh, they all have consequences for their actions...but it is further down the road and you may not even become aware of those consequences.
Be the best that you can be, i.e., hold your head up, back straight and do what is best for you and your family. After all, you are the rational one right now.
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.
