What does my girlfriend mean by saying good night to me?

A girlfriend saying good night to you can have many meanings or no meanings.

First, if you are still chasing this girl unexpectedly, the girl says good night to you, but she is impatient and wants to go to bed early. It's late, so to speak. He really needs a rest.

Secondly, if you have been dating for a long time, two of a kind's saying good night is just ordinary, which means urging everyone to go to bed.