The source told ET that tension between Zayn and Gigi's mom, Yolanda, ultimately led to their split.
The source tells ET the pair split and have been amicably working together to figure out how to co-parent their daughter. That is the No.1 priority for both of them. The source claims Yolanda was repeatedly showing up unannounced and uninvited and this led to some tension between them, which Zayn tried to resolve with his partner.
"Zayn felt that Yolanda was getting in the middle of things," a second source adds. Zayn and Gigi are "both very committed to working together to co-parent Khai and love her with all their hearts."
On Thursday, a source told ET that a disagreement between Yolanda and Zayn "turned hostile."
"Yolanda is telling people around her that Zayn struck her. Yolanda is extremely upset and it has caused issues with Zayn and Gigi," the source shared. "Gigi was not there for the time of the incident, so she’s had to listen to both sides."
In a statement to ET, Zayn denied the allegation, stating, "I adamantly deny striking Yolanda Hadid and for the sake of my daughter I decline to give any further details and I hope that Yolanda will reconsider her false allegations and move towards healing these family issues in private."
Gigi's rep also released a statement to ET, saying, "Gigi is solely focused on the best for Khai. She asks for privacy during this time."
Zayn and Gigi were first romantically linked in 2015, seemingly confirming their relationship when the model starred in his "Pillowtalk" music video. This marks the third time the pair have split. The first happened in March 2018, with the two publicly announcing their breakup.
The second occurred in January 2019, but they rekindled their romance by early 2020.
For more on the couple, see below.