What a sad situation. But it seems you do care for him, or you wouldn't be thinking about 'setting him free'. Maybe the thing to do is ask him if he wants to be set free. One thing I know is that staying together for the sake of a child is not the way to go. I was raised by two miserable people who did that and the effects are still with me many years later. Whatever you do I hope it brings peace to all of you.