Why do we marry over and over again

I was married once when I was in my twenties and it did not take. She was the love of my life and for reasons unknown to me, it did not work out. I have remained single all these years, because what is the point of getting married again, if I will always love my first love.

Some people cannot be alone and spend their lives marrying one women after another.  Why do we feel that to move forward, we must marry again? Is it some social need for acceptance in today's society? Do you feel you are a failure if you are in your 40's and not married?
 I have a friend of a friend that got a divorce in her late 40's and remarried the first guy she met three months later. They are having problems in their marriage right from the start. All they do is fight and disrespect each other.

 Some people think that I am against marriage. On the contrary, I am for marriage. I just believe that it is not in the cards for everyone. If I was going to remarry? I would have a better chance on trying to figure out what went wrong in my first marriage? Fix the problem, and remarry the woman that I have loved all my life.
This would at least make sense to me.

I welcome comments on the subject. I would love to hear how your current relationship is working out, not the b.s, but the truth.