Because,

It's my fault everything turned out like this.
It's my fault this is happening now.
It's my fault it's (almost) not there anymore.
It's my fault i'm trying to let go, when you haven't.
It's my fault i'm trying to let go, when i can't.
It's my fault i felt you were never there.
It's my fault i thought we could last forever.
It's my fault things became so complicated.
It's my fault it all even started.
It's my fault i'm supposed to be angry with you right now but I DON'T KNOW WHY MY HEART TELLS ME OTHERWISE.
Sorry, isly.