Marriages are made in heaven is a well known quote. We all think that we have the ability in selecting our life partner and it is true in some sort, but our marriages are decided by god. Most of the persons fall in love in their life, but some of them will get success in it, but most of them get failures in love due to various reason and marry some other person due to their fate. In my opinion god already write a person name as our life partner and we will get married with that person whenever the time comes. So God is the superior power and plans every things.
Some parents fix alliance to their kids at their child hood like auntie's son, Uncle and so on. Some of them are successfully got married with that person and some of this marriage is cancelled with due to some reason. Because god decision is not similar to men's decision.
Man proposes and god disposes
So We all think that the married of our son/daughter is successfully conducted by us, but every thing in the world is decided and conducted by the superior power God. He only have the ability to fix a perfect couple.