
This story really fails to convince us that Lily ever loved Anna, given how poorly she treats her. Throughout every chapter, Lily consistently mistreats Anna.
For instance, when Rose hides a letter from her father, Lily stays silent. When Rose badmouths Anna, she says nothing. But when Anna breaths it's wrong. She even blamed Anna for not being around when slept with Rose. Lily's is like a child blaming everyone else.

Yes I agree and yeah some ppl try so hard to convince me that Lily is just innocent and manipulated but let's be honest here yeah Rose did manipulate Lily and spun around stories but not everyone who did not feel familiar love is so eager to betray their love. There was no reason for Lily to visiting Roses chamber the first night, there was no reason to say I love you to Anna and then go say ily to Rose hours later, there was no reason for Lily to blame Anna for thinking that Lily did not love her, no reason for her to blame her for not intercepting when she herself was so willing to give herself to Rose. Alas I am not convinced that Lily loves Anna as much as Anna loves Lily

I can only assume this is due to bad writing. The author doesn't seem to know how to craft a compelling story and that she actually meant for us to care about Lily and Anna.
Whether this ends as an NTR story or a typical romance, the audience needed to be invested in Anna and Lily's relationship. However, no one seems to care about Lily, and most believe Anna deserves better. You're right; Lily was scared away by the orgy, otherwise she would have cheated on the first night.
Bruh wdym "you left me" like what was she supposed to do when you declared your love to Rose while riding her fingers when you were swearing that you loved Anna few hours before that like be so fr rn. Not to forget that missy was sneaking into Roses room the first night before Anna rejected her. Idk man I understand why she would think that Anna didn't want her after getting rejected so much but her love for Anna is so flimsy to begin with and she is so blinded by lust. I really do think that she does not deserve Anna but oh well let's see who she will choose in the final chapter.