After witnessing what happened at the party, Marco realized something.
His best friend is in danger and has to go after her.

Hide and Seek by Imogen Heap

Where are we? What the hell is going on?
The dust has only just begun to fall,
Crop circles in the carpet, sinking, feeling.

Marco packed a bag, some dimensional scissors, nachos, and other accessories.
"Marco what are you doing?" asked Jackie.
"I'm going to Mewni," he said, "Star needs me."
"Forget Star," said Jackie, "She has her own life to live."
"No... She is my life," said Marco, "And i should've realized it."
"Let me guess," said Jackie, "She realized that she loved you and she told you."

Spin me 'round again and rub my eyes.
This can't be happening.
When busy streets amass with people
Would stop to hold their heads heavy.

Marco realized it to be true.
"OH come on, its not like you feel the same way," said Jackie.
Marco actually did feel the same way about her.
But first, he had to do something.

Hide and seek.
Trains and sewing machines.
All those years they were here first.

"You know... I don't think this is gonna work out Jackie," said Marco.
"Wait..." said Jackie, "Are you dumping me?"
Marco nodded his head.
Jackie was furious.
"Let me explain something to you Diaz," she said.
Janna saw Marco getting beat up by Jackie.
"Ha!" said Janna, "I knew it wouldn't last."
Jackie walked out with anger in her heart.

Marco packed the rest of his things. He was upset at what he did, but he knew it was the right thing.

"I'm coming Star," he said.

Oily marks appear on walls
Where pleasure moments hung before.
The takeover, the sweeping insensitivity of this still life.

Hide and seek.
Trains and sewing machines. (Oh, you won't catch me around here)
Blood and tears (hearts),
They were here first.

A dimensional portal opened.
It was Star.
"Oops, forgot something," she said.
She saw Marco with a giant bag.
"What's going on?" asked Star.
"If you're going to Mewmi, then I go too," said Marco.

Mmm, what you say?
Mm, that you only meant well? Well, of course you did.
Mmm, what you say?
Mm, that it's all for the best? Of course it is.
Mmm, what you say?
Mm, that it's just what we need? And you decided this.
What you say?
Mmm, what did She say?

"What?" asked Star, "But its dangerous and..."
Marco kissed her.
"Marco what was that?" asked Star.
"It was a kiss," said Marco, "Anyways i'm going with you to Mewni to face Toffee."
"But Marco its..." said Star.
"I don't care!" said Marco, "I'd rather face a hundred of dangers with you than lose you."

Ransom notes keep falling out your mouth.
Mid-sweet talk, newspaper word cut-outs.
Speak no feeling, no I don't believe you.
You don't care a bit. You don't care a bit.

(hide and seek)
Ransom notes keep falling out your mouth.
Mid-sweet talk, newspaper word cut-outs.
(hide and seek)
Speak no feeling, no I don't believe you.
You don't care a bit. You don't care a bit.

"Marco..." said Star.
"Just shut up and listen," said Marco, "Jackie is the last person i'm gonna let hurt you."
"Marco..." said Star.
"I'm gonna help you save your kingdom and kick Toffee's butt!" said Marco, "I'll see to it that Mewni is safe even if it takes every inch of my body! Do you hear me Star? I love you."
Star smiled.
They shared another kiss.
"I love you too," said Star.
They walked hand in hand into the portal.
"There's no telling if we ever come back to Earth," said Star.
"I don't care what dimension I'm in," said Marco, "As long as I'm with you."
They went into the portal.

(hide and seek)
You don't care a bit.
You don't care a bit.
You don't care a bit.
(hide and seek)
You don't care a bit.
You don't care a bit.

(Star: Now there's a better ending to that season 2 finale.)
(Marco: ((Coming in with some Nachos)) Nachos for my Fiance)
(Star: YAY!)