I asked my girlfriend to sing a song for me, and she sang the song 'Decent' for me. What does this mean? Please explain

Decent was a very famous Chinese pop song sung by Lin Youjia. Usually, when a person sang a particular song to someone else, it represented that the person was expressing a certain emotion or attitude towards the other party. In this case, if my girlfriend sang the song 'Decent' to me, it might mean that she had a special feeling for me and hoped that I would use this song to express my love and gratitude to her. It could also be that she wanted to convey some values or life philosophy to me through this song so that I could better understand her thoughts and feelings. What it meant needed to be analyzed and explained according to the specific situation.