Baby what the hell are you thinking?
By the way you're screaming at me thinking you been drinking
I know that nigga's on your line
But he can't get what's mine, yeah

from MARKED FOR DELETION – MARKED FOR DELETION - Sort this out! Lyrics on Rap Genius

Meaning

The girl could be angered he’s found out about the phone calls, meaning she has something to hide.

Chris is also angry the thing’s been happening in the first place, and he tells her he refuses to let the man on the phone take her from him, and he’d do anything to stop it.

This half of the verse shows the anger that comes first before thinking.

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