What does it mean when you're out with your boyfriend/SO at (example: Walmart,Grocery store,or even a restaurant) And say the waitress or cashier is a cute girl, yall finish whatever yall were doing at the place and go home. But the next day you find that your boyfriend/SO went out of his way to search for that girl's name on his social media and add her?

To me its weird like whats the point of adding this random girl? Should this concern me and i should i talk to him about it or just leave it be.?