Why Did Justin Bieber Write That Should Be Me?

He wrot this song because this girl broke up with him and he wants   her back but the girl is DATING some other guy and hes telling her that that should be him and he wants her to pick him so thats why her wrote THAT SHOULD BE ME

I love that song

He wrote it because he wants the girl to pick him not the other man it should be me not him
 

He loves a girl (I don't know who he had in mind when he wrote it) but they were dating and they broke up but he still loved her. She found a new guy, "Funny how you used that time to have me replaced." I guess he was upset and wrote a soung 'bout it

His ex-girlfriend started to go out with a new dude when they were 13 and he needed to tell her that should be him.