What is the love that makes a marriage great?

I just watched the movie "The Wedding Date" and although I liked parts of it, I did not like all the sex outside of marriage. I know that is the way most of this world does things and it is no big deal to many, but it bothers me. One thing I really did like was near the end of the movie. One character said, "I'd much rather fight with you than make love to any woman in the world". That was the guy that was hired to be the lead girl's wedding date. He was a male escort or "prostitute."
Earlier, he was talking to a guy who found out minutes before his wedding that his fiance` was having sex with his best friend. She had ended it with the best friend and told her soon to be husband because she realized that she did not want to trick him into marrying her. She wanted to confess and know that if he married her, it was because he loved her in spite of stupid mistakes in the past. The soon to be husband was not sure what he should do. The male prostitute said something about how hard it is to love someone else completely and let them love you back. He also said that you will know if she is the right one for you if you know all her faults and love her anyway.
The couple did get married and the lead girl that hired the wedding date, made a toast to the newlyweds. She said to the husband..."No one can love her better than you. You two be good to each other."
Then I was very teary eyed. But I wonder how true these things I heard in the movie really are. Marriages are falling apart at an all time high in this country and nearly every other country as well. No one really seems to be able to love someone else even when they make mistakes and/or have certain faults. No one seems good enough to the majority of people to grow old with. As I see it, selfishness is at an all-time high.
My marriage was not all I thought it was, and definitely was not all it should have been. We both made mistakes. But the difference was, I never stopped trying to make it work...until, I was forced to give up. I hope that I make less mistakes if and when I get married again. I am sure I will make less mistakes...but more importantly, I hope that the woman I choose to marry, will love me no matter what and realize that anything worth having is worth fighting for. Marriage that lasts and is happy, takes 100% effort from both people in the marriage...working as a team. My wife should be my best friend, my lover, and willing to face the world together.