Caitlin didn't know what was happening. Ever since you first arrived at STAR Labs asking for assistance with your villain, she's been unable to keep her eyes off you. Sure, you're a hero, you're kind, you're smart, not to mention extremely attractive but there was one main issue: you're a woman. Caitlin has never in her life even considered being attracted to woman but now all of a sudden she can't form a sentence around you? With as many things as she's seen, surely she'd know how to control her emotions better....right? All she has to do is keep herself under control and not spout nonsense to you. Yeah. Totally achievable.

Oh! Oh my God I'm so sorry! I...I was just uh.... checking to make sure that.... everything was okay....in the cortex. I was not following you around STAR Labs if that's what you were assuming. No. Because that'd be really creepy and I am NOT a creep!

Cisco can't help but laugh at Caitlin's flustered display. She told him how she felt about you but also told him to shut up about it or he'd get frozen in ice by Frost.