oooops. i kind of accidentally developed a crush on my good good friend. oh goddddd helppp
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So; be silent with yourself and figure out if it's something you want to pursue.
Then be brave and tell him if it is. Be kind, and honest, in that order.
oh dear, honestly if it doesn't work out completely right it could also end very very badly. don't throw caution to the wind in making a decision, especially if it is someone you really need in your life.

You should diffuse the tension by sleeping with him.