i read The DID Sourcebook

have you tried journaling with him? you could ask him, but if it is too trying and you send him away again, he may grow angry with you.

i have a part (or ego state - still not seeing a lot of difference there) that cuts - and when that part gets out of control i get mad and we get into it. I can't seem to have peaceful relations with that part. =(
good luck.
kiya