Plot twist:
The cac was the one writing those captions. The black woman was cheating on the white dude with the black dude from the beginning.
She got pregnant and milked the cac for all his money and resources. Then she dumped the cac and started then officially started dating the black dude publicly while she was pregnant.
The cac was still giving her money even though she was with the black dude because she was pregnant with "his(the cac)" baby.
The baby is born and it's fully black. Come to find out the baby was the black dude's baby all along and she got pregnant by the black dude while she was with the white dude.
The white dude is the one who took the L and her and the black dude was laughing at him the whole time.