I would just tell him how you feel while you have the chance cause you don't know if you will get another chance to.
I really like this boy, and I have all year, but I don't know what to do. I am switching schools next year, so I might never even see him again. I have one last chance to ask him out. Should I go for it? What should I do?
I wouldn't tell him, because telling him would make you even more depressed when you have to leave...
