Danger! But you can’t live without her
Now you’re paranoid, checking on her cellphone
Making sure she ain’t like you alone

from Macklemore and Ryan Lewis (Ft. Buffalo Madonna & Macklemore) – Thin Line Lyrics on Rap Genius

Meaning

Because he himself isn’t trust worthy on his own, Macklemore begins to fear that his girlfriend isn’t being trustworthy on her own. He’s become paranoid because of his own actions. He realizes he can’t live without her which scares him even more that she’s slowly moving away from him.

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