Oh baby you, got what I need. But you say you're just a friend

What do you do when you can't stop thinking of someone?
Every time you're around them you get nervous, your heart skips beats, and you have butterflies in your stomach.
You look forward to spending time with them.
You imagine "what ifs" about you and them all the time.

But there's nothing you can do about these feelings.
I guess if I had more guts I could just put it all out there but that will never happen. Too much on the line for something like that.