You say that like Gale actively planned to try and kill Mystra. He was trying to give her back a piece of something that he thought was part of her. Meanwhile she was such a fool she couldn’t see that this mortal was pining to do something for her. Instead of saying it was dangerous she just kept saying “Nah babe, I don’t need anything, I’m good.”
So I’m not sure saying “Here. Kill yourself.” REMOTELY fits the ‘crime’ of making a mistake in trying to display admiration for your aloof idiot girlfriend who is supposedly a God but too blind to see what is right in front of her.