It has to do with change in a love life I think! Lots of different things... Like life in general but love too.

Well yeah it's about change, the person desires change, they want things that probably seem fake and plastic now but once meant something, to mean something again, and one of the ways to do that is just to start over. They're sick of faking being happy, they kinda think morbidly like the butterflies part. They don't fly they just die now. Like she/he doesn't focus on the good things (them flying around) and only them dying. And They're just unhappy with life, and the person they're with, or someone in their life is really not helping. Maybe they're the ones who are sucking the life out of a vulnerable person already. And I don't think this song has much to do with the phoenix idea, it's just them stating that that other person is tearing them apart. Not to tear them apart. They're probably asking them to tell them something sincere <:U. "Mean it truly, sincere heart, why do you do this to me? Tear me apart..." I feel like this lol!