Most Helpful Guy
He is aware that you have feelings for him and, for this, he does not want to hurt you further or cause drama by engaging with other girls on site you have access to.
Most Helpful Girl
He does not want you in his life. I know it hurts but he even told you himself that he is trying to move on and he wants you to stay in his past. Changing his number is a huge sign he wants nothing to do with you. This is why I am against people trying to be friends with their exes. I don't see how someone can consider a guy they had sex with their friend. Even the term friends with benefits does not mean friends.