Lyric discussion by smurf0 

Cover art for Life Of The Party lyrics by A Rocket to the Moon

i think this is about the guy being in love with someone who is complicated and can't make up her mind. and she goes back and forth because she's confused and either uses him or leads him on just to bring him down because she can't decide what she wants. and now he's tired of waiting around and is letting her go and saying that she's going to regret it but he won't be there anymore to fall back on.