Just scared of the truth and what the consequences are....
^^That line there says it all.
You are not responsible for his life, nor hers. ( He can`t be happy without you in his life? Sure he can. Would he be heartbroken, and grieve the loss ? Sure. At some point he`d start combing his hair again. Thats what Healthy people do.)
THEY are responsible for the well being of their own marriage.
- Care for them, but not at your own expense.
- Don`t take the weight of their world on your shoulders.
- Love smartly.
My best to you.