The actor's alter ego Ajay Kapoor is left devastated on UK screens this evening (January 28) as he discovers that his wife Priya has been cheating on him with bad boy Paul Robinson.
Priya (Menik Gooneratne) recently ended her fling with Paul, but the truth comes out when the Kapoors' teenage daughter Rani (Coco-Jacinta Cherian) exposes her mother's betrayal.
Joab told Digital Spy: "At first Ajay thinks his daughter is lying to hurt her mother. Priya and Rani haven't been getting along, so he puts it down initially to teenage angst.
"But when Priya has to choose between calling her daughter a liar and admitting the truth, she realises she has to come clean. Ajay is obviously devastated."
Viewers see another side to Ajay as he kicks Priya out of their family home, before getting his revenge against Paul with an unexpected punch.
Later episodes see Ajay invite Priya back to the house for Rani's sake, but it's clear that forgiveness may be a long way off. He also quits his job at the law firm, deciding that he needs to start putting himself first.
Asked whether the Kapoors can get through their rocky patch, Joab replied: "Ajay invites Priya back home for Rani initially - but he doesn't hate Priya, he just doesn't know her anymore.
"Priya wanted to end the affair with Paul because she realised she still loved Ajay and she had too much to lose. Ajay was always in love with her, so yes, I think there is a chance they can come through this - but it will take a lot of work on both sides.
"I think they have both been driven, particularly my character, to achieve everything - basically not taking enough time to smell the roses. They need to keep remembering how much they had before all this, how much they were in love at one time, and harness those feelings.
"When it comes to his job, he needs a change of scenery for the moment - but he loved being a lawyer, so I think he'll go back to it at some stage."
However, the actor also confirmed that viewers haven't seen the last of the drama for the Kapoor clan.
Asked about the scenes he is currently shooting, Joab replied: "There is a massive turning point in the Kapoors' lives coming up, which we're filming the aftermath of at the moment."
Neighbours airs weekdays at 1.45pm and 5.30pm on Channel 5 in the UK, and weekdays at 6.30pm on Eleven in Australia.
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