What does it mean to talk in a girl’s space about some feelings that fade away and forget them?

It means that when the relationship fades, people will not be as good as before. Friends are no longer friends. Once they are forgotten, forget it and don’t try to keep them.

This sentence is relatively Literary art, I can see that the girl is sentimental. Maybe she saw such a sentence somewhere and felt that it was well said and touched her heart, so she posted it

I want to say it here, but don’t think about it. So many people, who didn’t when they were young, were forced to talk about their worries in order to compose new words. When something happened, they always wanted to say something, but they just felt sad for a while.