There are two types of crushes:

1. A casual crush, you look at them and you're like "wow you're pretty cute I'd like to get to know you better."

2. Absolutely, undeniably head over heels oh my god are you fucking kidding me you are perfect wow I'm going to rethink every conversation we've ever had for the next 9 hours of my life please love me.

There is no in between.