What do the lyrics of Rainie Yang’s Black Moon mean?

My feeling is similar to that of 222.215.77.*

I think the male protagonist fell in love with another woman and does not want the heroine. I hope I can get the heroine’s forgiveness. The heroine is very sad[?] and then recalls every bit of the past and sings a song to ____[?] let go? Then she hopes to escape to the inner world alone[?]

Chaotic The lyrics of this song are not sad, but they sound more desperate than sad. I don’t know how to put it... That’s how I feel.

From the dark color of the MV, we can see that the heroine of this song has finally made up her mind. Determined to forget about the male protagonist, I hope that both of them can be fine... That's about it