How can I forget him and move on?

My best friend and I broke up a little over a month ago and it was a very difficult break up for both of us. We patched things up after a few days, and as weird as it sounds, we picked up where we left off but weren't exactly going out. That lasted for like..a month and I finally got sick of it; he started treating me like crap again (like how he did towards the end of our relationship), and I called him out on it. Since the end of our "thing", I've been talked to about how much he looked, flirted, and was all over, other girls. I don't want to like him..I want nothing more than to move on! He was soo bad to me and it broke my heart because..I was in love with him. I don't know what to do to just get over it! I keep thinking about him and the situation and everything he said we would be...asshole. If you have any good ideas on moving on, please, enlighten me! Thank you so much..God Bless ♥