Should I tell him how I feel? Please comment any advice too!

In a nutshell, I met this guy when I started going to school (like 4 years old) and we got close really quick. I got a crush on him within the first year meeting him and he had one on me. We didnt do anything about it but we still really crushed on eachother as we got older-skip through 8 years-we started to grow apart due to different 'friend groups', but we still flirted a lot with eachother (both of us asked the other out but we both said no because we thought the other was joking) I started to feel much more intense feelings for him but I didn't want to admit I was falling in love with him. 

ANOTHER 2 years (so 10 years since we first met) and we were seriously growing apart, but whenever it was just the two of us alone with eachother it was just like when we first met. He made feel like there was an almost electric charge flowing through me when we were together and I'd never felt that way for anyone else, he still looked at me the same way he did when we were younger. I thought maybe he still liked me but I didn't want to get my hopes up.

 

Again, 2 years later (so 12 years since we first met) we were having to get interviews for further education. We had both applied to this really 'prestigious' school but he didn't know I had applied. On the day of our interviews he saw me and he looked so proud, we didn't have a chance to talk to eachother but he kept smiling at me and just looked so proud. By this time in our lives, we had grown even further apart but I felt like I was in love with him. Due to anxiety and depression, I missed a lot of time from my final year of school with him. He asked my friends where I was and if I was okay. I saw him at our prom, when we collected our exam results, but saw him for the last time when we were submitting our results in to the 'prestigious' school. Again, he looked so proud of me and I was so happy we were going to the same school. Then came trouble, because of my anxiety and depression, the school turned me down because of my poor attendance. He got in, but I had to go to a different college.

So now it's 2 years since I last saw him but I still miss him so much, we'll be going to different universities later on this year and I don't know if I should tell him how I feel before we definitely go our separate ways-I might never see him again and the idea of that is breaking my heart. It's distressing me because I don't know how he truly feels about me and I don't want to loose him if he has feelings for me because I love him more than anything else in this world. We are both nearly 18, yet neither of us have had a serious relationship before or ever had sex. Part of me is wondering if he has been waiting for me the way I've been waiting for him. I don't know if I should contact him to meet up somewhere then confess how I feel for him. I know some might think I'm too young, I've thought that too, but to have such intense feelings for someone for nearly all my life I think means I should. I'm terrified if he doesn't feel the same way about me though because I don't know how I would handle being told the feelings weren't both ways. Should I tell him or should I leave our story where it is? Sorry this is so long but it's like 80/90% of my life story so far tbh 😂