Offset is missing his estranged wife, Cardi B, in the wake of their split.
"[Expletive] YALL I MISS CARDI," he wrote.
Offset's post had received over 422,000 likes as of Monday morning. Fans reacted in the comments, with many propagating rumors the rapper cheated.
"She shouldn't take him back but it's nice to see that he understands what he did and what he lost," one person wrote.
Entertainment Tonight said Cardi B rapped about divorce during her concert Friday in New York.The former "Love & Hip Hop: New York" star changed the lyrics of her song "Motorsport" to reflect her split from Offset.
"I turn Offset on. I told him the other day, 'We should get divorced,'" she rapped.
"I really don't like how people say me and my husband -- whatever he is right now to me -- is doing it for publicity," she said.
"I wouldn't put my family in a bad name for no [expletive] publicity."
Offset and Cardi B secretly married in September 2017 and welcomed their first child, daughter Kulture, in July.
Cardi B announced her split from Offset in a video last week, saying she and the rapper "just grew out of love."
