No one cared when he ran away.
No one cared that he didn't stay.
No one cared that he'd cry all day.
No one cared when he pleated for them to stay.
No one cared that he was pushed away.
No one cared that he needed them.
No one cared on how they treated him.

He learned that no one would care if he needed them to stay.
He learned that he could no longer cry all day because he didn't need to stay.
And because of that he learned no one will care if you cry or if you pleaded for them.