3. "I like you as more than a friend. Do you feel the same?"
As for 1. and 2., you'd be better able to gauge the risks to YOUR friendship with YOUR friend than anyone else here would.
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Music Theory 101: Cadences.
Authentic cadence: V-I
Plagal cadence: IV-I
Deceptive cadence: V- ANYTHING BUT I ! !! !
Beethoven cadence: V-I-V-I-V-V-V-I-I-I-I-I-I-I-I-I-I-I
-I-I-I-I-I-I-I-I! I! I! I I I