IT's a shame Retrouvaille isn't until October. You obviously can't just let things slide til then. I think I would ask what he plans to do about the situation at work. And see what he says. Perhaps there is something less drastic that he can do to avoid being in the same classroom with her. Perhaps he could ask for a transfer to a different classroom. Or perhaps he feels he has another way he can deal with the situation.
I know you want him to quit, but you cannot force his hand. He must make such important decisions in his own life or he will feel that you are controlling him like a parent controls a child. And that wouldn't be good for your M either. I have substituted myself. The pay is only about 1/2 what a teacher makes in a day, and then it's not every day and there are no benefits. Unless he has another way to make a living, I would be suprised if he quit.
