I was on Sissy's side... (spoilers)
First of all, she had been living the best life she could while also being a social media influencer. It was not only until she met Emma again that old wounds started to resurface. Also Alex was a bitch, I know what Cecilia did to her was horrible but she was a child. At some point you have to learn to forgive and forget. Also, all of Emma's friend seemed very superficial and didn't give a damn about Cecilia until they discovered that she was an influencer.
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