Lyric discussion by tactforwit 

Cover art for Um... lyrics by Onelinedrawing

I think the song is about a seperation with someone as well. "So wont you go?/ Lie to your love/ Just go" kind of connotes some sort of way he said that if you're not going to seperate from someone, then "who the fuck cares you heartless bitch, just cheat on them" sort of thing.

but it really does sound like a going off to college thing.