What "touching” is acceptable when interacting with a married man?

Lately I’ve realized my married colleague has a tendency of touching me when he speaks to me... by “touching” I mean a tap on the upper arm, shoulder or even on the knee and now he felt comfortable touching my low hanging necklace in order to flip it over. I don’t think that he does this with everyone and it isn’t... show more Lately I’ve realized my married colleague has a tendency of touching me when he speaks to me... by “touching” I mean a tap on the upper arm, shoulder or even on the knee and now he felt comfortable touching my low hanging necklace in order to flip it over. I don’t think that he does this with everyone and it isn’t cultural so I’m kinda wondering if this is normal...he hasn’t made any awkward comments or advances toward me so maybe it’s just being friendly?
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