Shelbel - Just be you, treat him with compassion as you would treat any friend that is going through a personal catastrophe. Just because they treat us the way they treat us, we shouldn't act in opposite way to our true nature. And I'm not advocating to "rescue" him. Just do what feels right for you.
I feel bad for your H, but you know what they say in the MLC land. Sometimes they have to loose everything in order to hit bottom and hopefully start crawling out.
Hang in there
M53 H54 D17 M33Y T38Y Bomb OW 09/09 OUT 10/09 BACK 11/09 OUT 01/10 WANTS TO R 04/10 BACK with OW 05/10 Wants to Reconcile 05/11 I said NO