Most Helpful Girl
Lets get something straight here...HE didn't start a "FWB" thing...you BOTH did. That is the worst thing to do if you actually was hoping to get him back,or truly be friends with him.You allowed him to sleep with you without having everything else a positive relationship would have. Girls always do this thinking he will change his mind down the road when he is not. Instead he is going out and dating whomever he wants and getting familiar sex from YOU...that is until he finds another girlfriend. He wants to be friends so badly so you can stroke his ego (since he clearly knows you still want him),so he can keep tabs on you,and to possibly continue getting free familiar sex. That's about it. Why? Because if he truly wanted to be with you...he WOULD be with you.
if I were you,I wouldn't have anything to say to him for a longggggggggg time. Good luck.