Work colleague flirting with me or nah?

Ok so my work colleague is married I think and has 2 kids. He is 36 and I’m 30.

I don’t know if it’s just me but I might need some clarification if this man is flirting with me playfully or not…

He always says hi to and stares at me whenever we walk past each other in the corridors

He sits down next to me and starts talking to me (he mentions his 2 kids to me, but never his wife)

He says to me he saw someone loook like me and thought of me the other day

he then today starts talking to the girl next to me and involves me but also is being cheeky to me and the other girl…

im not sure if it’s innocent or if I should be worried

Work colleague flirting with me or nah?
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