Jhené shared that she and Big Sean first became friends in 2012 the year that her brother died of cancer. They had recently worked on various songs together, but their relationship was strictly professional because they were both in relationship.
The musicians officially started dating back in 2016. Then in 2018 they separated and after bouncing back in 2019 after a brief split, the duo is still going strong and remains undeniable contact. It turns out that a key source of their bond was the strong friendship that started before their romance.
The couple recently confirmed that they were pregnant after a fan tweeted that she saw them at the store and that Jhene was pregnant. This will be Jhene’s second child as she has a daughter from a previous relationship. Sean will be a father for the first time and he has shared that he can’t wait to become a father. The couple did not reveal the gender of their unborn baby.
Source
https://www.complex.com/music/big-sean-jhene-aiko-reportedly-expecting-their-first-child
https://people.com/music/big-sean-jhene-aiko-relationship-timeline/