Sai had been clear about her distaste for pp in public and thats not something coming from a place of venom but purely as reaction to what pp does. Samrat can see it clearly and is free to make his decisions. Sai has never hidden what she feels about pp-virat relationship status despite virats public announcement about only being "friends" . She is not going to "interfere" in Samrat's life the way she does with devi/virat because she barely knows him. But they do have a bond despite only recently meetinng each other, she can relate to him n she wants Samrat to be happy. Unlike pp, virat who have painted a picture of "happily moving on" , Sai has been very open about her mistrust for pp. She has not concealed it and Samrat has been watching everything closely. She only mentioned her feelings about pp to virat/pulkit/shivani when she was probed to spill them. It wasnt a voluntary attempt on her part. She has made her inclination to NOT be part of anything pertaining to pp - like pooja/breakfast very clear but at the same time she doesn't want to hurt devi/aai/samrats feelings so she bends when they request her to do something....she doesn't project her feeling about virat-pp onto aai/devi/others. She participates in family rituals thus far out of a sense of obligation that stems from the ehsaan that virat/his family have done on her by providing her shelter, food, opportunity for education at a time when she had no one. Sai is not ungrateful. She will always be indebted to virat for those things.
In the process of one year, Sai has developed a bond with virat. Sai clearly has shown she has feelings for virat, wants to be his wife, has adopted this family that taunts her repeatedly as her own because she craves belonging after losing her only family member, she has developed bonds with his aai/tai/bua/brothers, everyone! She wants to believe him but she can't because pp-virat keep doing something to make her insecure. For every atep forward that she has tried to take, something happens to push her three steps back.
She has never expected virat to stop her from leaving. Everytime she has attempted to leave it has been deliberate, genuine and not a ploy to get attention. But she melts when virat or aai/mohit/etc make her stay. Because she genuinely loves n cares for them. She has stayed because Virat asked her to -because she believed him when he apologized , until recently despite every fight/argument she has always held him in highest regard n always respected him. She believed that even if they were not husband-wife he'd always be a well wisher, a guardian, her only family. Thats why she stayed. And she wants to leave because she feels like now virat has become so frustrated that he has stopped treating her with the respect/regard he used to give her in the past. Pyaar toh kabhi nahi tha but fikr, respect thi. But when she sees that go away, she has taken the call to leave. Until now Sai, and her aabaa in her subconscience have always regarded Virat as this righteous man who would never deliberately hurt her but seeing his recent behavior with her has shaken that belief. Thats why she says my father wouldn't want me to be with a guy that has no love/respect for me. Until recently Sai always saw her aabaa's parchaai in virat n virat knows that. She has always drawn parallels between them. But now he has done certain things that have made Sai second guess everything she once believed to be true.
Virats behavior and the behavior of this pack of hyenas in CN have made Sai feel lost, broken, scared, unloved and lonely. Despite it all she cant help but care for all of them deeply and selflessly n she has always tried to accept them as they are because they are all she has now to call her own. She keeps trying to fit in , find their acceptance without compromising on her self respect n values and her core personality... But now she is reaching the threshold of her tolerance. She wants more than anything for everything to be real, permanent - her marriage, this family, but her illusions keep getting shattered....