Do you really get over your first love? Can you really be friends with that person?

I always had weird feelings about my first break up and how I was hung up on him for so long before I actually let myself date again. But whatever it was, never stopped us from being friends. We actually dated for 3 months and were friends for 6 years. 2 years ago I was talking to a friend who was going through some relationship issues about my past/current relationships. He asked several questions about that first relationship and opened Pandora's box. I got so angry thinking about it and I realized what an a*hole he had been and I decided to cut him off as a friend. I didn't answer his phone calls nor emails. Eventually I emailed him saying that I couldn't talk and to please understand. He never contacted me again until he tried to be my Facebook friend and I ignored him. I feel like I did the right thing but at the same time I feel childish. Do I miss my friend or do I miss the ex/first love? Should I be his friend again?