I do think apathy is a necessary part of not caring (by definition). I was so obsessed with getting my separation contract and now I just don't care what he does. I'll continue to find ways to organize my life around not needing anything from him. In those instances where I can't get by, I'll just send him a paper to sign. So far he's been doing that.
I had the same thoughts. I knew his issues and was willing to help him with them. How could that not mean anything. How could it be more satisfying to live a series of lives with people who will really never know you or care about you. Oh well, too late for all of that. Gotta focus on other stuff now.
Wouldn't it be nice to be with a guy who had a lot less baggage?