Claire Sweeney has revealed that Cassie "just can't help herself" but tell Tyrone (Alan Halsall) the truth when she returns to Coronation Street tonight.
The character - Tyrone's biological mother and the daughter of Evelyn (Maureen Lipman) - made her cobbles debut earlier this year but it soon became apparent that she was battling a long-term drug addiction.
Evelyn took her away from the street in order to go cold turkey and get clean - and despite having met Cassie, Tyrone still has no idea who she really is, with his gran having told him that his mother had died years ago.
"Evelyn has been looking after her 24/7," Sweeney explained ahead of Cassie's return. "We can only sort of imagine what that's been like for both of them in stuck in that flat it with that situation [but] Cassie has done it and for now she is clean.
"She's very grateful to her mother for being there and making her do it but she just feels literally holed up in this flat and she wants to get out just for a coffee or a bit of fresh air or a walk.
"Evelyn is a bit worn-down with it all and there is an element of them reaching a plateau and she gives in, she thinks that she can finally trust her but really she can't. Cassie has kind of abused that trust and she even takes money out of her purse again!"
After the pair move in to a rented flat in the Weatherfield Precinct, Cassie catches wind that Tyrone is at the Bistro and sneaks out to find him - and when she does, she tells him that she's his mother.
"It was not premeditated, but once she is there [at the Bistro] it is an impulse," she continued. "She's watching and them she just can't help herself, it just comes out. She wants the truth to prevail.
"I don't think she's doing it from a place of causing harm and problems, or from a place of wanting to get one over on her mum. She just wants the truth to come out.
"She wants him to know, she wants a family and the only way she can get that family that she's not had for all this time is to tell the truth, even if people get hurt along the way, I guess."
Coronation Street continues Mondays, Wednesdays and Fridays at 8pm on ITV1 and ITVX.
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