Can a gaze be enough to fall in love?

I haven't really enjoyed any exciting romantic life for the past 3 years. And that was ok - so I felt. I am a 25y woman working in finance (12h a day) and simply wasn't interested in dating.

A few days ago a new colleague started working at another division (he is more like a pretty boy, and perhaps also younger than me). We have not met, nor have we ever spoken a single word. But when our eyes first met crossing ways on the staircase, HE was staring in my eyes - so deeply. At first, I did not think anything of it - although I felt some light tension in my stomach.

Later the same day we met grabbing a coffee. Again, we didn't speak. But again, and although he was in company, he was staring at me like nothing else mattered for him. It didn't feel aggressive, because his proud look turns somewhat soft and somewhat shy when our eyes meet.

I have no idea why, but for the past weekend I could not think about anything else than fantasizing romantically about this co-worker. I really don't know what is happening with me... I think I am love-struck. Because of a simple gaze. Am I fucked?

TL;DR : Can a gaze be enough to fall in love? Has it ever happened to you?