But what could it be? And can Dee-Dee forgive him?
FOR WEEK COMMENCING 19TH FEBRUARY
When Joel leaves a loved-up Dee-Dee's flat, a receipt falls from his wallet and she notices it's from a Jewelers in December, and Joel clearly spent a lot of money.
Calling at the solicitors, Joel finds Dee-Dee, Adam and Alya joking about his expensive taste.
Heading out, Alya spots Joel in a car being driven by a sullen looking woman. As she watches them, her suspicions mount.
Later, after Alya shows her the CCTV footage from the bistro, Dee-Dee confronts Joel and she's shocked when he admits that he has a wife, Emily, a daughter, Maisie and his wife threw him out when she was pregnant because he had an affair!
Coronation Street continues Mondays, Wednesdays and Fridays at 8pm on ITV1