Yusef will tell Zainab that he wants to be with her while at Tamwar and Afia's mehndi ceremony. His sister-in-law Shameem overhears and announces to the congregation that they are having an affair, causing Masood to punch Yusef.
"The whole day turns into a disaster. When Shameem sees Yusef and Zainab together she automatically thinks they're having an affair," a source said. "Everyone struggles to come to terms with what they have just heard.
"But not Masood. He sees red and punches Yusef. [Yusef's girlfriend] Denise is stunned by the news and confronts Zainab but she denies everything and flees the ceremony.
"Afia is devastated and demands answers from her dad Yusef. He assures her it is all lies before leaving to find Zainab. It's one hell of a fall-out."
Tamwar and Afia's wedding airs a week on Tuesday on BBC1.
> Masood is devastated as Zainab kicks him out
> Zainab and Masood's marriage hangs by a thread