As reported last week, Nick dumps Eva in an upcoming episode after she wrongly accuses him of having an affair with Kylie Platt. She makes the accusation during a special event at the Bistro, publicly humiliating Nick.
When Nick refuses to forgive Eva for her antics, the feisty blonde starts pursuing Jason Grimshaw in a bid to make her ex jealous.
However, Tyldesley told PA: "[Jason's] a good looking guy but he's not the brightest button. She totally uses Jason to try and make Nick jealous. Unfortunately it backfires and Nick's really not that bothered."
The actress explained that Eva hits rock bottom as she struggles to cope without Nick in her life.
She said: "She'd invested everything into the relationship and she's depressed and angry to say the least… she's well and truly gutted."
Coronation Street airs Nick and Eva's break-up next week.