The reason I said the song might be about Astarion is because the composer liked the comments where people believed the song is about Astarion. It's meant to be a love song. It does play during camp and when you speak with Astarion in camp. I haven't noticed if the song plays while speaking to other companions. Also, what bold part are you talking about?
The bolded part was the part of your post that I had bolded (made thicc) when I quoted it, so you would easier be able to tell which part I found confusing.
But I got my explanation from you anyway so thanks for that