This is my first tab, so don't be too rude!

This is the mashup that Bieber did. I couldn't find the chords anywhere, so, here it is :D
-Hannah-who-loves-Bieber-and-Darren-Criss

Am (x02210@1)                                       Dm (xx0231@1) Am (x02210@1)                                            DmHow (xx0231@1)could you be so heartless? Oh How could you be so heartless?
AmYou (x02210@1)were my sun 
EYou (022100@1)were my earth
C (x32010@1)                                                  GBut (320003@1)you didn't know all the ways I loved you, no
AmSo (x02210@1)you took a chance
EAnd (022100@1)made other plans
C (x32010@1)                                                                GI (320003@1)bet you didn't think that they would come crashing down, no

You know why?
AmCause (x02210@1)in the night, I hear them talk
                    DmThe (xx0231@1)coldest story ever told
                     FSomewhere (133211@1)far along this road he lost his soul
                                       AmDm
To a woman so heartless
                                                   AmDm
How could you be so heartless?

That's why I said,
AmHopped (x02210@1)up out the bed
              FTurn (133211@1)my swag on
                                          GTake (320003@1)a look in mirror said "whats up?"
                          CEh, (x32010@1) I'm gettin money, Ohh, Ohhh
              AmI (x02210@1)want the money, money and the cars
                       EmCars (022000@1)and the clothes, the shows, I suppose
                           AmI (x02210@1)just wanna be, I just wanna be successful
                          EmI (022000@1)just wanna be, I just wanna be successful, yeah, said
Am (x02210@1)                   Em7
I just wanna be, I just wanna be successful
       AmAnd, (x02210@1)In the night, I hear them talk
        DmThe (xx0231@1)coldest story ever told
                     FSomewhere (133211@1)far along this road he lost his 
                                   AmDm
 A woman so heartless
                                                  AmDm
How could you be so heartless?