How to know if a married man likes you or just being friendly toward you at work?

I’m so confused bc this guy his married and lately his been friendly towards me and he won’t always come and talk but there are moments that he will but it can be short conversations he usually will greet tho every morning but the day before he was complimenting me how well I do the job and that I am pro at it etc but he don’t always speak to me so is he just being friendly or more?

How to know if a married man likes you or just being friendly toward you at work?
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