Go melt back into the night, babe
Everything inside is made of stone
There’s nothing in here moving

from Bob Dylan – It Ain't Me, Babe Lyrics on Rap Genius

Meaning

By “In here” he means inside of his heart, as it is “made of stone.”

Either he is jaded, and cannot fathom being in love, or he is no longer in love with her/never was.

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