Wow.... he must really have some guilty feelings right now about his FOO if he won't talk to them anymore. He probably is feeling really used right now too. And maybe even a feeling little foolish for being used for so long.
Definitely DO NOT give him the "I told you so" speech. Just comfort him right now, you may not even need any words to do this. He will see you as his support once he gets over the anguish of cutting them off and has some time to let it settle in his mind.
