Breaking up with my boyfriend?

I broke up with my boyfriend last friday because we hadn't been happy for awhile. He was supposedly really shocked when we broke up, but when we were breaking up neither of us cried or yelled and he agreed we both needed to go our separate ways. However mid break up his friends walked up so I just said bye and left. I texted him sunday night asking how he was doing and he basically told me he had no feelings for me anymore. Which made NO sense because he told me the break up really hurt him. I decided that I should talk to him on monday and see where his head was. When I got to his house we talked and all he would ask me questions like why we didnt work out, and then would say nvm when I would try to answer. But he would say he has no feelings for me. We had a great talk and he concluded that we should be mature and be friends right away and told me to date other guys. On wednesday was our graduation. We were walking partners with two other guys, but he was SUCH a jerk to me. I was totally happy and nice to him, but he was being awful, which was so weird bc he is one of the nicest people I have even met. The boys even agreed he was being rude. I cried during graduation and it just sucked. I am not sure what to do now. I miss him, but I dont want to be in a relationship with him anymore, it was a great two years, but we need to move on. I obviously still love him, he was a GREAT boyfriend, super kind and he treated me amazingly. I just am not sure what to do with him now. He has always been my best friend too