wow. i don't know really what to say that might help but honestly, if he didn't seem angry or upset then it's ok...or at least it means you're not an %#@&#! or anything. It seems he wasn't prepared to be popped, but it does seem like he isn't afraid of a situation like this... he must have experienced dissociative clients in the past.

i would base my feeling on how he seemed and what he said to you.

for you it's all very individual and scary and new... but if he has experience then he has probably seen quite a lot. Let that reassure you. It's like if i told my T something i feel bad about.. like SI or something, to me it's HUGE, but he has talked with a LOT of people with the same issue so he is ok.

and that's it you know, he is ok... and if he wasn't he'd take care of himself.

i really can't offer anything helpful about the phase out thing itself because i have never experienced it or been with someone in that... it sounds very overwhelming and scary.