Shy guys, why would you hover around a girl? What are the reasons? What is the message behind this?

This guy works with me, but he lives in the opposite direction, in another city near here.

Nowadays I saw him driving his car where I pass by with my bicycle. I was going to work. When he saw I looked at his car, he accelerated.

I want to understand this. My friends say he likes me, but isn't it easier to talk?
Shy guys, why would you hover around a girl? What are the reasons? What is the message behind this?
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