All about me, me and me

Super-mom Kate Gosselin couldn't have worded how I feel any better, "On a good day, I feel relief. On a bad day, I feel failure." I have those days back to back or have those feelings on and off in the same day. I want to get beyond the days of having high hopes because in the back of my mind, I know I shouldn't have any hope at all. At least it's finally out in the open that he isn't in love with me anymore, and hasn't been for awhile. Why do people do that? I say people because women are just as guilty as men. Why put someone you care about through that kind of pain and agony? I met a woman at my parenting education class that was married for twenty three years, and out of the blue her husband told her he just wasn't in love with her anymore. I guess I just don't understand that phrase. I don't understand that after putting everything you have into a relationship and making a vow to be with someone for a lifetime, that so many just give up. What happened to the "olden days" where couples stuck together literally through thick and thin and for better or worse. Too many give up because it's the easy way out. The consequences don't matter and many think the lives of the others involved won't be affected. Again, I don't understand where so many acquire this emotionless way of thinking. I don't think all of my misunderstandings come from being young. I just want to know why society has shifted so much into being selfish instead of selfless.