In last night's episode of the soap (October 23 2019) Sinead discovered Bethany had left her notebook at her flat and read a story that the waitress wrote.
The story was about a young aspiring writer who fell in love with a journalist who was helping her, but she felt guilty as his wife was dying.
Realising the similarities between the story and the real life situation she confronted her husband Daniel.
Eventually he admitted that he had kissed Bethany just the day before, leaving Sinead devastated.
As the pair argued, Sinead's cousin Craig came into the flat and she told him about Daniel and Bethany's kiss, leading him to throw his cousin's husband out of the flat.
As Daniel went and got drunk, Beth went to stay with Sinead. Meanwhile Craig went and confronted his friend about her and Daniel's kiss.
Approaching Bethany and her grandmother Audrey, Craig yelled: "What sort of person are you?"
At first Bethany seemed confused and he continued: "Both of you, you disgust me."
Although Audrey tried to calm Craig down, it didn't work and reminded them both that Sinead is dying.
When Bethany asked what Daniel had said, he told her: "I don't know who you are anymore I really don't."
Bethany tried to ask him if Sinead knows and just replied: "As if she didn't have enough going on already."
You tell her Craig!
Meanwhile Daniel's family and Sally Metcalfe witnessed the argument.
The argument left viewers divided, some were happy to see Craig standing up for Sinead.
Other's weren't happy with Craig's reaction.
Coronation Street airs on Mondays, Wednesdays and Fridays at 7.30pm and 8.30pm on ITV.
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