As silly as it is may seem to ask for relationship advice online, I feel that the opinion of..?

someone who doesn't know me and isn't going to say something to just make me feel better like family or friends might could possibly be a good idea. So here's the story I'm a junior in high school, my now ex-boyfriend was a senior (he recently graduated). We dated for a year and one month, the night before prom he broke up with me. For two weeks prior to that he was different, more stressed and always fighting with me. I tried my hardest to get along and keep peace and fix things, but in the end got dumped. For three weeks after the break up we continued to talk because he wanted to "work things out." Randomly he decided after three weeks he was done and didn't want to get back in a relationship "right now" and stopped talking to me. Since then he's been trying to get with other girls and hangout and flirt and it hasn't worked out for him at all. When he finds out guys talk to me, and hang out with me he gets jealous and sad and texts me to yell at me and put me down, then goes back to being sorry as if he wants me to sit around and be miserable while he does whatever he would like to and then him come back when it's convenient for him and me still be waiting around? Which is totally unacceptable. I never contact him, or act needy and upset like most girls tend to do after a break up, I'm killing him with kindness but still living my life and not showing sadness. His recent claims were that he eventually wants to get back together he just needs time, but to others he says he's having much more fun single, and he seems to be enjoying himself just fine, as if he totally got his memory erased on the last year and month we spent together? Now that you've gotten the background what do you think I should do? I don't spend my days moping I'm finishing up school, hanging out with friends and family, just living life normally but deep down I really wish we could just fix things. Do you think he actually thinks of it, and hurts over it? Do you feel as if he'll come back around and this is just a phase? Or is he serious when he says he's enjoying life better now single? It's an extremely confusing situation for me, and as good of a job as I've done holding strong, not acting sad, living my life, not contacting him I still can't help but think about it and feel sad about it secretly deep down. Advice please?