He offered to pay my grocery bill?

I was at my local supermarket shopping with my Mom and we walked towards the checkout line. There was a guy that entered the line and I didn’t pay any attention until I noticed him moving closer and closer to me. I move a step over and he movers over. At this point we were shoulder to shoulder
and it seemed like the cashier thought we were together. I whispered and made a sarcastic joke to my mother “I guess this is my husband” in another language.

I pulled out my cash and told the the cashier I had a separate transaction and he tells the cashier “I’m going to pay for her.” I started laughing and I thought it was a joke until he tapped me and insisted to pay. He tells me that I look good in the dress im wearing and that I made his day so he’s going to pay.

I appreciated the gesture but I’m curious what was his motive because it was awkward 😂😂
He offered to pay my grocery bill?
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