Shopkeeper Dev's wife Sunita, who earlier this year admitted she was unhappy in their marriage, is now having an affair with Karl Munroe.
Harkishin believes that Dev ought to tell Sunita to leave her children and family home at number 7.
"I would say, 'Dev, mate, you've tried your best. Throw her out and find a 22-year-old with a bit of cash'," he told Soaplife.
The 53-year-old actor recently predicted that Dev will "be prepared to sweep an affair under the carpet if it meant his family was secure".
Shobna Gulati last week claimed that her character Sunita is in love with Dev as well as secret lover Karl.
Over the coming months, viewers will be left to wonder if either Dev or Karl's partner Stella Price will find out about the affair.