Lyric discussion by Mollzzz 

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

I think that this song is about a boy falling in love with a girl who just ends up breaking his heart after he tells her he loves her. The girl is complicated and parties a lot (possibily famous)

They're on you like a tatoo They're watching every move you make

That could be a line about papparazii

After she dumps him he realizes all her problems and knows he's better off without her.

Now you're free to be the lonely life of the party Girl you'll see Lets get one thing straight You're gonna regret you left me