I think this is about the singer breaking up with his girlfriend that he's been going out with for a while: "I no longer believe we're who we used to be/ Four years of mistakes, I knew you couldn't take it/ Now all this time will tell if we were meant for someone else". He may still care about her, but they have too many differences "I'm locked and loaded, so let's get this over with/ Because I can't stand the thought of not seeing you again". idk, just my interpretation
I think this is about the singer breaking up with his girlfriend that he's been going out with for a while: "I no longer believe we're who we used to be/ Four years of mistakes, I knew you couldn't take it/ Now all this time will tell if we were meant for someone else". He may still care about her, but they have too many differences "I'm locked and loaded, so let's get this over with/ Because I can't stand the thought of not seeing you again". idk, just my interpretation