Coronation Street spoilers follow.
Coronation Street's Mary Taylor gets tough with former friend Christina Boyd next week following the revelation of a shocking secret.
Christina makes a difficult confession tonight as she reveals that she's a compulsive spender and has fraudulently taken out credit cards using other people's identities – which has included targeting Mary, Glenda Shuttleworth and Christina's ex-husband Lenny.
Related: Coronation Street exclusive! 6 huge spoilers reveal Christina's secret
Her current partner George is sympathetic when Christina explains that it's a serious spending addiction and she needs support rather than condemnation.
Christina attends a support group and George is willing to draw a line under it. Sadly, Mary isn't able to forgive and forget so easily – sternly warning her that it'll take time to rebuild their friendship.
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"Mary doesn't cope with betrayal well – she even mentions the time that her son Jude pretended to be a marine biologist," explains our Corrie source.
"We've all seen Mary's mood swings in the past – she may be sweet and quirky, but she's not someone to get on the wrong side of!"
In follow-on scenes next week, George and Christina arrive home to No.11 and are baffled to find Mary mysteriously holding a flash sale.
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Christina tries to protest as Mary flogs various household items which don't belong to her. However, Mary bites back by pointing out they were bought on her card, so they must be hers to sell.
"Christina wasn't being malicious in getting her loved ones caught up in fraud and spending sprees," continues our insider. "She's been trying her best to pay the money back herself, but Mary is so angry that there's just no reasoning with her."
The next day, Mary still refuses to let it go as she makes more jibes at Christina about what she's been up to.
It seems that Christina is struggling badly with her addiction, as she discreetly looks at a phone message which reads: "Package out for delivery". Will George find out that she's continuing to spend heavily?
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"Part of the reason she got herself in trouble is because she's the one who always gets the drinks in," Amy Robbins, who plays Christina, recently told us.
"If someone who I considered a friend took out a credit card in my name, I’d find that very hard to forgive – until I saw how truly sorry they were and accepted they had a problem.
"Spending is an addiction like any other, like gambling or alcohol, and this storyline is taking it seriously. It's so easy to get into debt."
Coronation Street airs on weeknights at 8.30pm on ITV1 and streams on ITVX.
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