I've been all running up night I've been all running up night But it's 2:00 a.m. and I can't think about anything but you I've been all running up night I've been all running up night With a tight chest and a conscience I can't get out of my head All I think about is you, you All the calls that I know you saw but you said didn't come through So all I think about is you, you All the things I could say to make you think I'm with you-know-who These insecurities Are gonna ruin me And I know this jealousy will ruin us We gotta stop faster than we can run We are twenty-first century love It's 4:00 a.m. and I don't wanna know All the things that you are gonna do Without me by your side Without me by your side I've been all running up night I've been all running up night With million reasons why And another million reasons why All I think about is you, you And that face that you make when you want her but you say you don't These insecurities Are gonna ruin me And I know this jealousy will ruin us We gotta stop faster than we can run We are twenty-first century love Yeah, we are twenty-first century love All I think about is you, you, you All I think about is These insecurities Are gonna ruin me And I know this jealousy will ruin us We gotta stop faster than we can run We are twenty-first century love Yeah, we are twenty-first century love Twenty-first century love Yeah, we are twenty-first century love