Problems

Right, so there's this person that i really really like. He's really funny, a bit strange but most people take advantage of him. The problem... he's my teacher :/ there's an on growing problem with this as my group of friends have little jokes that link to him. Only 2 of my friends know about this. Ever since i confessed how i feel about him, i've been feeling more awkward around him or when someone mentions his name. I never used to talk to him much to start off with but now, i hardly do. It's got to the stage where i have to see him every day at least. At the moment he's ill, but still comes to school. I feel so sorry for him. In about 3 months I will leave school and i know that i'm really going to miss him. I've known him for 5 years and how i feel has grown stronger over the years. I really don't know what to do. Me and my friend have decided to add him on Facebook when we leave (and when it's legal) Our plan is to get this card for him and write showing how much we are thankful for everyhing he's done. Unlike most teachers, he actually cares if we pass or fail. I can't stop how i feel because i've already tried it before. My friends that know, don't really know to what extent i like him. This makes going to school tough but when i know that i'm going to miss his lesson.. then it's even harder. I really don't know what to do anymore, I don't know if when i leave, that i would still like him. What should i do? :/