What does it mean that my ex-boyfriend gave me a song to listen to misty rain?

My ex-boyfriend sent me a song, which means I miss you. According to the relevant inquiry data, the meaning of "misty rain in the world" is to express a kind of bitter acacia in the first two sections of the song, just like the unrequited love of an infatuated child, feeling deep, sad, painful and suffering, so my ex-boyfriend sent me a song "misty rain in the world", which means missing you.