I'm Just Your Problem

"I'm Just Your Problem" is a song in the episode "What Was Missing," written by Rebecca Sugar and sung by Marceline, backed up by Finn, Princess Bubblegum, and Jake. The song seems to be about Marceline's anger with Princess Bubblegum. The final few lines raise questions of her true feelings, implying that, while her frustrations are genuine, so is her desire to reconcile.

Lyrics
Marceline: La da da da da, 

I'm gonna bury you in the ground, 

La da da da da, 

I'm gonna bury you with my sound,

I'm gonna drink the red from your pretty pink face

I'm gonna...

Princess Bubblegum: Marceline, that's too distasteful!

Marceline: Oh, you don't like that? Or do you just not like me!?

Sorry I don’t treat you like a goddess

Is that what you want me to do?

Sorry I don’t treat you like you’re perfect,

Like all your little loyal subjects do

Sorry I’m not made of sugar,

Am I not sweet enough for you?

Is that why you always avoid me?

That must be such an inconvenience to you

Well, I’m just your problem

I’m just your problem

It’s like I’m not even a person, am I?

I’m just your problem

Well, I shouldn’t have to justify what I do

I shouldn’t have to prove anything to you

I’m sorry that I exist,

I forget what landed me on your black list

But I shouldn’t have to be the one that makes up with you

''So, why do I want to? Why do I want to…''