The pair's characters Roxy Mitchell and Alfie Moon have become close friends on screen, but Roxy is harbouring stronger feelings.
Jessie Wallace recently returned to filming as Alfie's wife Kat following a break, but Simons told PA that she is still unsure of where the story is heading in the long term.
Simons commented: "It's been lovely to work with Shane, he's a great actor.
"We haven't had a kissing scene yet, I don't know if we will. He's a very generous actor."
The 35-year-old also voiced her support for EastEnders' new boss Lorraine Newman, who recently took over from Bryan Kirkwood.
She said: "I haven't been at EastEnders under the reign of a female yet, so it'll be interesting to see what different choices she makes. I think she's going to do a sterling job."
Simons and Richie have both previously said that they do not want a full-blown affair for Roxy and Alfie.