Torn - Finn Wolfhard x reader

Unexpected arrival

I can almost feel my heart shatter into pieces. I peer around the top of the stairs and look at the front door. One tear slowly rolls down my cheek as a lump forms in my throat.

They're kissing.

My boyfriend and Millie Bobby Brown are kissing.

I only see it for a split second, but that's all I needed. All I needed for my heart to crumble into dust. I sprinted down the stairs with my eyes closed and my hand covering my mouth, trying to cover the big ugly sobs that were escaping.
"Y/n!!" Finn exclaims. "Wait!" I don't turn back I can't bear to look at him. Everything is a blur, the corridor becomes scarily distorted and I stumble to the back door. I can hear voices but my brain can't apprehend what is being said. The rain is still pouring outside and wind is blowing me backwards but I don't care, I just need to get home.
I can feel my phone vibrate in my pocket and I know it's Finn, trying to explain what I just saw, but there's nothing to explain, they kissed and that's it.

I run all the way home and slam the door closed once I'm inside.
"Y/N?" I hear my mum shout from the living room, but I just continue upstairs, sobbing my heart out. I can't even face her right now.

I throw myself onto my bed and cry so hard no sound comes out.
How could he have done this to me?
Does he not love me like he said he does?
A million questions run through my mind as I slam my fists into my bed in frustration.
I hate him.
I never want to see him again.

~2 HOURS LATER~

I must have cried myself to sleep because I'm awaken by my mum shouting my name.

"Please just leave me alone." I shout back down stairs.
"There's someone here."
"I don't care, I just want to be alone, please." I cry.
"He says he really needs to talk to you, Y/N." She pleads with me. I realise it must be Finn at the door. "He's come all the way here in the middle of a storm, please just come down stairs." She continues.
"Well you tell Finn that I don't really give a shit because he's a complete bastard and I never want to see him again." I shout back down before throwing myself back on my bed and sobbing even harder.

How the hell will I be able to face him at set tomorrow?