I know it is so tempting. But you know, if you do decide to lend the money you can really make it so he doesn't lose face. Just keep it really neutral and don't make it a huge deal.
I know it is pessimistic to say but it does seem to be true, they can be nice when they want to be/ want something and when they don't they run and ignore. I've been thinking about it and our h's actions are very passive aggressive. There are some interesting articles on how to deal with that behaviour. By ignoring you it makes you stuck - they have all the power.