Joel, I've come to this thread way late, but wanted to give a few words of encouragement.
When you come across situations like this it's like a call to go deeper; dig deep. Of course this makes no sense....addiction is tenacious, cunning, baffling. That guy may have more money or appear to have more money....but it's not all it's cracked up to be....it could just be he doesn't do anything to make her really look at her addiction honestly and she can go on in her addiction and feel somewhat "supported" by him....either financially or otherwise or both. You've indicated that he is an addict too.
But, think about this: Is he really "richer"? I put richer in quotes for a reason. Why? Because some of the "richest" things don't cost a dime....REALLY....they just don't. Think about values and God-given talent....and love....those thing don't cost a penny....not even....so when you say "rich"....it's not all it's cracked up to be. Take heart, friend.