Break Up- What Doesn't Kill You

My boyfriend and I recently broke up. My sister sent me this song and I really like it.

This is the chorus:

What doesn't kill you makes you stronger
Stand a little taller
Doesn't mean I'm lonely when I'm alone
What doesn't kill you makes a fighter
Footsteps even lighter
Doesn't mean I'm over cause you're gone

What doesn't kill you makes you stronger, stronger
Just me, myself and I
What doesn't kill you makes you stronger
Stand a little taller
Doesn't mean I'm lonely when I'm alone