I thought this place was for writing about song meaning, Not ranting about twilight.
I think it's about being hooked on someone and they 'set your soul alight'. 'Glaciers melting in the dead of night' is a cold heart melting and the 'superstars sucked into the supermassive' is someone (I'm guessing Matt) falling for somebody who isn't good for them, but you can't help it cause like a black hole they pull everything towards them even if they end up destroying it.