Glad you are so caring. That sounds really bad, giving up what you care about most at least for me has been one of those last steps over the edge, one I've thought about taking quite a bit in the past but luckily haven't gone past that threshold yet.

If he feels any bit like I have been, and trying to put myself in his position, also having suffered through depression for a while, he may have lost all hope, and feels there is no chance for redemption or ability to reclaim what was lost and so may be giving up. Not accepting some of your offers, it seems like he may think that even that cant give him a chance and is just a waste. The longer I've been depressed the less I feel I can be back to the way I was, better times as then they were. He probably feels that all options are exhausted and have been tried, and may not be able to imagine any other possiblities.

If there is any way to give him hope back again, hope that things can change, that there is stll life to live, it could help him. When I become sick like that, there are very very few words that can change things, but If you find the right ones, it can make all the difference. My doctor calling me up, just to know if I felt better, and our discussion which made me feel he understood my problems, and giving new options on possible ways to deal with my issues, really saved me from some desperate and dangerous moves I otherwise end up taking.

Try to talk to him and ask him questions to try to imagine yourself in his position, the better he feels you truly understand him or are trying to understand and aren't just trying to be sympathetic, the more he may open up, and gain hope back again.

Just my thoughts, he could be feeling completely differently but its what it seems to me from my perspective...