Have you tried asking?
I've honestly had to fall back on that a number of times.
I know, it's hard to do!
The worst that happens is you don't feel the same about each other. And that would've come out eventually. Your friendship will either survive or not, depending on how strong the feelings are and what type of people you are.
Alternatively, you may be stressing out that the other person is having feelings you don't share. If they don't have these feelings, you're probably putting a strain on the friendship by worrying, without even realizing it, so clearing the air is good!
However, if you have feelings and don't act, you could miss your chance if the other person doesn't make a move ... except to move on.