I miss him and I don't know how to move on.

So for some context me (F 17) and my now ex who we will call C (M 16) broke up about a week ago. We had just barely gotten back together from the last time we broke up. Both times were his decision. I'm finding it so hard to move on, I know that he wasn't the best boyfriend but I loved him with all my heart. I get that we are teenagers and these feelings may pass but I'm finding it so hard to move on. I have heard from mutual friends that he was using me that being the reason that we met up about a week ago. That argument turned into him breaking up with me. His words being "I cannot deal with your emotions anymore, I'm done with this. These talks and I'm done with us." It hurt so much, and I feel so stupid for giving him a second chance and it all went crashing down again. He's still in my life due to our social circle and allot of other situations, we work right next to one another and we both wrestle for our school. If anyone has any advice on how to move on and heal I would really appreciate it.