Should I tell him?

Absolutely. If আপনি don't you'll regret it. If আপনি don't want to tell him personally, write him a letter অথবা যন্ত্রপত্র explaining. But always add that if he doesn't feel the same way, আপনি would like to remain friends. Rejection will always feel bad, but আপনি will get over it. I wouldn't worry, you;re still young, there will be others in your life, but this will be the turning point. Go for it. And Good Luck!