The actor's alter ego Alfie Moon is currently in a relationship with Ronnie's sister Roxy, but viewers know that he still has feelings for estranged wife Kat.
Last week, Samantha Womack announced that she is returning to her role as Ronnie for six months. After spending two years in prison for abducting Kat and Alfie's baby son Tommy, Ronnie is heading back to Albert Square ready to put the past behind her.
Richie told PA of the upcoming storyline: "We're going to start creating the Kat and Alfie phenomenon again, but there's a threesome now. As opposed to just Kat and Alfie, you've got Roxy. And then of course we get Sam Womack back in, and you've got Ronnie back in the scene.
"And all of a sudden Alfie's with her sister, and Ronnie's responsible for the whole baby swap thing - there's going to be a whole new dynamic."
Richie added that he has a good working relationship with both Jessie Wallace and Rita Simons, who play Kat and Roxy.
He said: "They're very different but they're great fun. I laugh with Rita and she's a real family person and we talk about our kids all day.
"There's a history with myself and Jessie. We kind of started the show at the same time, and the whole Kat and Alfie phenomenon back in the day was created."
Womack will begin filming at EastEnders again in the summer.
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