How to know if my coworker is being friendly or if he is interested?

Anonymous
I have this friend recently he has been staring at me a lot more and has become touchy like he would touch my arm multiple times. Or if he walks past he would brush my arm with his and being playful. I don’t mind it of course. Recently he asked if I had any plans for the weekend? Mind you he has NEVER asked me that before so that was a shocker to me. While we was still talking someone interrupted our conversation he seemed to have gotten upset. He has been doing all these small little things but I don’t know if he is interested or just being friendly. We have like quick conversations since we are at work but the one day we got interrupted he didn’t like that. He looks and smiles all the time. Then if I do something he copies me and he will walk past me looking at me and smiling. He puts his phone down and says hi all the time. I don’t know if he is being friendly or if he is interested. How do men show they are interested in a woman? Is my question
How to know if my coworker is being friendly or if he is interested?
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