I've this experience.I've lost one of my close friend..We were friend for about 12 years but for some reason we broke up ..It was a nasty shock for me and I couldn't believe that our long-term relationship has finished,but after a couple of months I get used to it..whenever I see two girls that are close friend I miss her but this is life and everything is possible.People go and their memories stay with us

I would be sad and I will try to get her/him back. :)

Well, in Mexico the people say that the bestfriends are forever. I have a bestfriend since high school, is a good men. Her wife is best friend too. It's difficult to have best friends, because is someone who you trust.