I was reading a story today about staying friends with Exes. A smart philosopher guy named Alain De Botton thinks the answer is no. He also put the below vid together. 

I am on the NO side. I have just never been able to stay friends with any Exes. I tend to burn the bridge. I also think it is a little unfair to your potential future partners. Plus once you have feelings with someone some feelings will always remain in my opinion.

Trace is on the side of YES. Why say goodbye to a friend. If they played a part in your life in the past, why can't they play a different part in you future?