How can you tell if a shy guy likes you?

So essentially I have a coworker who is very quiet very shy from what I can tell. Kinda scrunches in on himself and tends to look uncomfortable. But he's near by me a lot and if I have to stay behind to do something there's a 50 /50 shot he stays back with me or will come find me to let me know it's break time or something.

He will occasionally sit with me during my lunch or break not always but sometimes and will talk with me if I start a conversation but I can't tell if he's talking to me because he wants to or because of social obligations.

How can you tell if a shy guy likes you?
How can you tell if a shy guy likes you?
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