Is my coworker interested in me?

So this may be nothing at all... but I'm curious to see what you guys think.

There is this coworker that I have. We never really interacted as we work in different departments, but I see him sometimes. He seems kinda reserved, but nice and professional.

A few days ago I saw him. We were doing our own thing, but we suddenly noticed each other and stopped in our tracks. It's like we both froze and stop doing what we were doing mid action. We made eye contact and 2 seconds later we literally smiled at the same time, like in synchronicity. He seemed genuinely happy to see me, and he gave me a lowkey shy closed mouth smile. We held eye contact while smiling for like a second and then I looked away. I don't know, it felt like time stopped, everything was frozen while that was happening. And I felt tension and chemistry. I wonder how long we would've held eye contact if I didn't pull away out of shyness. Anyway, next time I see him, I will hold eye contact for longer :D Just wondering if it means anything?