My question is do you think I have pushed and pursued too long and his mind is made up?
Don't try to figure him out. Decide what you want to achieve and what your mini goals are, so you would know you're on the right track (it's unlikely he will recommit to M right away after your changes, but something like asking you out for lunch would be a mini-goal).
Decide on your strategy and tactics. NC, GAL, 180 are tools.
From the first glance it looks like you should GAL (for yourself!) and get him curious about you. I'd say limit all communication with him strictly to business and kids, but don't be punitive about it. Don't initiate contact other than for business. No how are you doing just because follow-ups.
