Boyfriend left school, I’m still there

So because of corona we are off school and my boyfriend was in year 11 so he’s now done and will be leaving. I’m in year 10 so I’ll be back next year. I feel like missed out on the next few months we were meant to have together. We walked to school and home together and spend break and lunch with each other and just seeing him around would make my day. I don’t wanna go back and not have him there, cry every time I think about. Just had to get it all out. I just I don’t do change and I don’t wanna go back and not have him there, it won’t be the same. Imma miss him and I just don’t know if I can do it without him. I knew I’d have to eventually but I was gonna prepare for that but it’s so sudden ad never knew that day would be the last day. I just ugh. Any advice would be gratefully appreciated but just needed to let it out or to talk to somebody. We are both really upset about it and I can’t stop crying! I also suffer with anxiety and depression, he was always there to help.