I love you so
(Hey) that's what you'll say ( that's what you'll say)
You'll tell me baby, baby, please dont go away (don't go away)

from Bruno Mars – Runaway Baby Lyrics on Rap Genius

Meaning

The girl will tell him that she loves him, and that she wants to be with him, in attempt to get him to quit his promiscuous ways and be all hers.

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