Why would a guy at work want to see my face without the mask? He was putting me on the spot and I got shy to show it?

I got all shy to show my face and he kept insisting and then he goes to say that he is going to add me on Instagram when he saw me using my phone, and then at the end of our shift I see him again and he teasingly says that he is going to add me on Instagram? Is he just trying to make fun of me or just curious?
Why would a guy at work want to see my face without the mask? He was putting me on the spot and I got shy to show it?
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