Leanne and Nick cause a stir on the cobbles next week by getting back together, leaving Tyldesley's character Eva heartbroken as she has only just split from the Bistro boss.
Eva has recently been getting on well with half-sister Leanne (Jane Danson), but the upcoming romance twist will cause a new rift between them.
Tyldesley appeared on Lorraine this morning (June 21) and discussed the depth of Eva's feelings for Nick (Ben Price).
The actress commented: "She really does love him. She fell for him big-time, so it's completely heartbreaking."
Pictured: Catherine Tyldesley on Lorraine today.
However, Tyldesley confessed that she is secretly backing Leanne and Nick's future once she steps out of Eva's shoes.
She said: "As a viewer, I'd quite like that! I like them together."
Tyldesley added that she is delighted with the current drama surrounding her character, who is also now playing a role in Sunita and Karl's affair storyline.
"I feel so lucky - it's brilliant," she explained. "Every time I get a script, I get more and more giddy - I can't wait for the next block to arrive. And there's some great stuff coming up in the next few weeks."
Coronation Street continues on Monday (June 25) at 7.30pm on ITV1.