After almost 5 years, Chris Brown ready to have a kid with Karrueche

After almost five years together Chris Brown is ready to have a baby with his on-again/off-again girlfriend, Karrueche Tran. He posted a pic of Karrueche and said they need to have this baby, which will guarantee Karrueche for at least 18 years. But wasn't he with Rihanna five years ago?