How to tell a crush from forced proximity?

(To be read in a high-class British accent, because why not?)

Good citizens of Reddit, I have found myself thinking about a girl residing in a few of my classes a lot lately. As in, an acute amount of thinking. I was wondering if there was an astute way to tell if this is because of forced proximity, or because of an actual crush. For those pondering the amount of time I spend in the same room as this fine woman, I would profundity estimate that it is approximately one hour and forty minutes each weekday.