What are the subtle flirting signs from a male coworker?

I am working in a hospital and share an office with a male colleague. He has a very interesting personality ( can come across as odd or acts odd when I am around) and I am not sure whether his interactions with me are because he is friendly or flirtatious.

He constantly jokes around and recall many things I have said previously. He tends to avoid personal questions but sometimes I notice he is comfortable around me more than our other female colleague, who sits with us in the same office.

If I am quiet, he tends to try to open a topic for conversation and only wants my attention on him compared to my other colleagues. The other day he was surprised seeing me changing my drink order and asked “since when you started drinking this, I have never seen you have it”.

I am trying to think logically and I don’t want to analyse things incorrectly and jump to conclusions. My gut feeling tells me has an eye on me but at the same I don’t want to be carried away, where his action could just simply be that he is friendly.

What are the subtle flirting signs from a male coworker?
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