Should you make a move on someone you're sure isn't interested in you?
I'm certain you're not supposed to do that (at least unless you're 100% confident like you). And while the person I'm thinking of can be hard to decipher, it's already looking like they aren't interested.
But people (mostly men for some reason) keep pressuring me into pursuing them, even though the lack of interest is pretty apparent. It also reminds me of that time college, where I did approach someone who (I didn't know) wasn't interested. Which resulted in them freaking out, calling the cops, and the police driving me home while they calm this person down, while also giving me a quick lecture on how making moves on someone who isn't interested qualifies as sexual harassment, and to be more careful next time.
And even without that, coming onto uninterested people still seems like a dick move to make (even if unintentionally) that no one wins from. So it's probably best to next this person in favor of someone else.