This sort of happened to me, In high school I sat next to this girl for 2 years in most classes, she was the only girl to this day that I got on with so well, we were both really comfortable around each other. I look back on messages that she sent me and back then I failed to pick up on her OBVIOUS liking to me. She ended up moving to Australia and we haven't spoke in like 7 years, I REALLY miss talking to that girl, she was truly awesome and amazing.