if you love someone that will be gone from your life

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well. I'm in love with a guy just called him 'x'. I don't know why I love x! x is just always be in my head, and everytime I see x, my heart beats very fast and I always don't know what to do if I meet x. But inside my heart I always want to talk with x, say that I LOVE HIM! but it's impossible! because x is not the person that will respond to someone who say 'I LOVE YOU' to him..x won't care! and for few days, x will be gone to college! I won't see him anymore! I just don't know what will I do! So I won't have any regrets if x leave me. please, can any of you give me some advice?