"Eva is unaware that Maria has slept with her boyfriend, Aidan Connor, and the two girls have struck up a close friendship.
Talking about the "awkward" storyline, Catherine said: "[It's] to the point where I'm getting the script and my toes are curling.
"It's getting SO cringey."The storyline will unfold over the next few months and the confrontation probably won't happen until the new year.
"I do believe it will be quite explosive - I can't wait!"
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