I'm not sure everyone'll think it's a good thing, but I try to take marriage where it's at. Ok, a lot of people screw it up: when it happens that often, I don't know if we can blame the individual, y'know? I think it really does just come down to the idea that it's difficult to make even a seemingly healthy and stable romantic relationship last. I try to accept that, and I try to accept that forever-type relationships of any kind (friendships etc) are rare.
Marriage to me is saying "yep, it's rare, but I'm willing to give it a try". And maybe you make it or maybe you don't. The other part of my acceptance of the fleetingness of various relationships is that I don't think that the quality or value of the relationship is at all cheapened by it's limited duration. It takes so much more than love to make something WORK, so I don't think that just because something didn't work that two people didn't really love each other.