What does my friend's girlfriend mean by having dinner with her best friend and bringing me food?

If this is the first time we meet. And it's in your friend's hometown or your friend's treat. Maybe your friend's girlfriend wants to be a landlord. So, be friendly to you. If you always eat together and then they do it, then they want to introduce you to her best friend. That's what it means. If you feel the same way? Then answer her. You can also care more about her boudoir. If you don't like it very much, then you should also say thank you generously. Don't be so polite! Even if you don't like it, be generous. If you like it, just tell your friends, that's for sure.