From my pointof it is not a good idea too marry your friend. the problem is as a friend you share alot of things with him/her which you can take it as granted but when your friend is your life partner then all those things becomes important and can not be tolarated. To know everything about someone can be harmful as well. Also it all depends on how matuared you are. the best thing is to make your life partner your best friend instead of other way.....