Marta was Rush's 3rd wife. Marriage is no big deal to him, so the idea of sticking it out to work on it is clearly not in his nature. I've never really seen him as a poster boy for traditional values anyway. He's as Hollywood as any on the left are. But he talks a good game.
I applaud you on your marital longevity. 15 years and counting for me.
Continued success in your marriage too.