I miss my ex so flipping much

Ok, so like me and my ex still talk and stuff which is honestly not that surprising because before we dated, we were best best friends yk. Like we would call each other constantly and stay otp even while one of us was asleep (even for like 4 hours or more). Plus, he taught me like everything about soccer and a LOT of animes so he honestly, he was like a brother to me, which now it kinda seems weird because we dated but whatever, he was always by my side and now we're a lot more distant. That's what led up to me missing him so much. When we dated, he was terrible, like he would never text or call me, and when we would he would tell me to shut up. He was also talking to one of his old crushes and had her in his bio as his "best friend" and when I yelled at him for it, he said I was being dramatic and stuff. But also, he was ALWAYS trying to call her instead of ME, his own GIRLFRIEND. After that stuff happened we were still together but we were EXTREMELY distant. Then 5 days later he broke up with me. At first, I was ok with it since he was acting like a dick, but now I genuinely cry over it daily because of all the good memories that he brought and all the times he would tell me that I was the love of his life. It hit me even harder when he said "let's stop talking" because I never wanted to stop talking to him. He was like a part of me yk. Now we kinda talk but usually he always starts the convo because I'm too scared to. Once I asked him for advice and he helped me out so much and said that he would always be there for me no matter what and I felt myself wanting to just tell him how much I loved him and how much he means to me, but I know he probably doesn't feel the same way. Last Wednesday, at this Orchestra concert (he's in orchestra btw) when his (our) grade was sitting down, he said that when he was looking back, he saw me watching the younger grade's concert. I don't know if this really means anything but basically, he told me that after the concert through text and I responded with "yeah I saw you too" and we had a whole conversation about other stuff and how bad our grade's orchestra did LOL. But it was so weird, like he actually acknowledged me and texted me about it. Does he miss me too? I hope so but probably not. On Friday, we had Prom and when I was walking into the school, I saw him and one of his friends and my friend, hmmm I'll just call her A, she told me that she overheard them saying my name. At prom I didn't see him nor his friend. I wonder if they didn't go because of me. I really hope not, or maybe I do, I don't even know. But later me, A, and another friend went to McDonalds. That was SO good, but it didn't distract me from him. Now it's Sunday and I'm fighting the urge to text him again. (Edit bc I forgot smth) I also now have councilor/therapy sessions at my school because of my damn anxiety😒 UGHH (at least I get out of gym though) anyways byeeee!