Queen Vic landlord Alfie learns about wife Kat's mystery love affair in next Thursday's (September 13) episode.
Speaking to Inside Soap, Richie admitted: "Kat makes an excuse that she's been out with Kim and he has to believe her. In a marriage you need to believe your partner or you've got nowhere to go."
Teasing the pair's showdown, the actor revealed: "Alfie's expecting Kat to admit there's some bloke that fancies her, but she breaks down.
"That's when he realises this is much bigger than he thought and she finally admits she betrayed him. So you're about to see Alfie's heart break in two.
"He doesn't think she'd lie to him again, not after everything that's happened in the past couple of years."
Branning brothers Derek, Max and Jack as well as Michael Moon are all contenders to be Kat's mystery lover.