Megan posted this song on tumblr and in the instagram video she posted, you could see the chords too.
here's the song :) https://www.youtube.com/watch?v=AFYHLlpVLo0 

  Cadd11     G       
e|---0-------0------|
B|---1-------1------|
G|---0-------0------|
D|---3-------0------|
A|---3-------2------|
E|---X-------3------|

Capo 2

Cadd11 C G Am

      Cadd11             C               G        Am
I got walls too high for anybody else to climb
      Cadd11             C             G        Am
I got my heart locked up with a key no one ever finds 
      Cadd11             C           
So when I try to let you in 
        G                 Am
When it ends you won't be back again 
      Cadd11                   C                     G        Am
I got chains too tight in this pretty little head of mine

Am               Cadd11                C          G
If I don't let you in you can't tear me up inside 
Am               Cadd11               C                      G*
But if I don't let you in I can't have you for the rest of my life 

      Cadd11                   C                     G        Am
So just go ahead go ahead and leave like you're gunna do
             Cadd11         C                     G        Am
I'll just be hoping praying waiting like I'm used to 
Cadd11                 C                     
Never gunna stop never gunna quit trying 
G                         Am
Cuz I know one day I know I'm gunna find him 
Cadd11          C                 G
I don't believe anybody when they say 
Am
Nobody stays 

Cadd11 C G Am

   Cadd11             C                    G        Am
If you get to close I'll go n pick another fight 
   Cadd11              C                     G        Am
I'll be sleeping alone thinking bout you all night 
       Cadd11          C 
Cuz if I try to let you in 
       G               Am
If it ends I won't be me again 
         Cadd11               C                          G       Am
I got my heart locked up with a key I didn't think you'd find 

Am               Cadd11                C          G
If I don't let you in you can't tear me up inside 
Am               Cadd11                C                      G
But if I don't let you in I can't have you for the rest of my life 

      Cadd11                   C                     G        Am
So just go ahead go ahead and leave like you're gunna do
             Cadd11         C                     G        Am
I'll just be hoping praying waiting like I'm used to 
Cadd11                 C                      
Never gunna stop never gunna quit trying 
G                         Am
Cuz I know one day I know I'm gunna find him 
Cadd11          C                 G
I don't believe anybody when they say 
Am      Cadd11
Nobody stays 
       C
Nobody stays
       G     Am
Nobody stays 
       Cadd11   C    G    Am
Nobody stays

Am                 Cadd11           C      G
If I push you away tell me it'll be okay
Am                 Cadd11           C*      G*
And if I run away promise me you'll stay

      Cadd11                   C                     G        Am
So just go ahead go ahead and leave like you're gunna do
               Cadd11         C                     G        Am
I'll just keep hoping praying waiting that you never do... 

      Cadd11                   C                     G        Am
So just go ahead go ahead and stay like you said you would 
             Cadd11         C                       G        Am
I'll just be hoping praying waiting that you really do 
Cadd11                   C                     
Glad I didn't stop glad I didn't quit trying
G                         Am
Cuz I knew one day I was gunna find him 
Cadd11          C                 G
I don't believe anybody when they say that
Am         Cadd11
Nobody stays 
       C
Nobody stays
       G     Am
Nobody stays 
       Cadd11   
Nobody stays
       C
Nobody stays
       G     Am
Nobody stays 
Am           Cadd11*
Cuz baby you stayed