He's using your past history to manipulate you into staying with him.

She's your partner on the group project that you've been dreading

He hates being your roommate.

Hello everyone!

<...

Jealousy

"The Kiss"

"That's my wife."

Her idol

The pocky game

Hickeys on your neck

Baby fever

Come on, one little pill won't hurt

Oh no! He's a pervert!

You don't understand, it had to be this way

Don't test him

Seeing your big brother again

"Good puppy."

How can he look you in the eyes again?

Pain

"Girl, what do you see in him?"

Crawling back to you

Nasty dog

"You can't just drop that and then shut your eyes as if nothing happened!"

It's pathetic, really

He's overprotective of you

It's just flirting, so what's the harm?

You want him for his pills

A heartfelt reunion

Mingle with them

You think he hates you

First date