You mean that your girlfriend sent you the song "Crescent Bay", probably because she wanted to express her love for you. Or she simply thinks the song sounds good, so she wants to share it with you.

Girls’ ideas are wild and unconstrained, and sometimes you don’t need to think so complicatedly. Since you are a couple, there is a high probability that she wants to share something with you or express her love for you. Of course, if you don’t believe it, you can directly ask her why she sent it to you.

Judging from the meaning of the lyrics of this song, the lyricist hopes that everyone can bravely pursue true love and work hard to preserve those beautiful memories. Therefore, your girlfriend probably hopes that the two of you can cherish this relationship together.