Why were these girls looking at me at the coffee shop?

I was working this morning at a coffee shop and I notice these group of girls were sitting at an adjacent table.

About 10 minutes later I saw this girl looking at me and then her boyfriend looked at me so clearly they were talking about me. Then one of the other girls started to look over at me for a sec.

Like they made it pretty obvious they were looking at me lol like when I talk to my friends about someone we look in a more discrete way like as we’re walking towards them not look at them right after each other!

Why were these girls looking at me at the coffee shop?
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