The meaning of Qing: 1, the name of an ancient high official; 2. The ancient monarch was a minister; 3. In ancient times, lovers or good friends expressed their kinship terms; 4. Last name;
Here, I think it should be understood as: expressing a dear title.
The girl's note "I love you" can be me (love you) or I love you.
If you are not mistaken, you should be a person that girls value very much, maybe just for fun.