You're attracted to something about her, and that's for sure. Don't judge yourself for feeling strongly about it one day, and not as much the next. It's not love that's wavering, its a crush. It's normal to feel on-and-off about a crush, because you're not totally sure about how you feel about them. If you were, it'd be closer to love.

In my own personal interpretation of this, it seems to me you haven't fully accepted that you like her. You seem to want to deny it instead of embrace it-- which makes sense, since she doesn't feel the same way. Try deciding if holding onto this feeling will hold any benefit to you, or if keeping them & convincing her to like you is worth trying.