"
I'm only human
And I crash and I break down
Your words in my head, knives in my heart
You build me up and then I fall apart
‘Cause I'm only human, yeah
She says that she is just a human, a person like you, me, and everyone, she crashes and breaks down, the boy's words are in her head and like she's telling that she can't forget what the boy or the song she's dedicating to, knives in her heart like her heart is broken or been hurt by someone, someone builds her up like someone completes her again but she still falls apart because she's only a human. And the meaning of a song is like she's telling that everyone's just a person, human, and she's telling that nobody is perfect.