I have never been in this kind of situation. But I totally disagree with those who think that marrying someone who was his/her best friend is a good idea. To be frank enough, marrying someone whom you know for so long itself is a bad idea because as soon as those people enter into a relationship called "Marriage", they get bored very soon. you hangout with someone, have fun, spend some quality time with him/her, then finally one day it is very sure that they both start discussing about their future with each other.