Should I accept my ex boyfriend friend request on facebook?

Anonymous
This is the second time that my ex boyfriend had sent me a friend request. He recently sent me one and I don't know if I want to accept it. I explained to him multiple times that I'm already in a relationship (5 years) with someone else. He don't accept "no" for an answer. We tried being friends but that didn't turn out well. I don't know what to do anymore. I don't want to be cold and harsh to him. What should I do? I'm running out of option. Please please help
Updates
+1 y
I was about 18/19 and he was my first. I don't understand why guys tend to hold on to their first. The sex was great and he knew exactly how I wanted it but he "hustle" on the side and didn't want that kinda life.
Should I accept my ex boyfriend friend request on facebook?
4 Opinion