When Sai said 'Waise bhi logon ko bhagane ka department tho aapka hai' to Pakhi, there stood a deeper meaning to it.
What made Samrat run away on the very next morning of his marriage? It's none other than Pakhi didi.
Now the same person wants Sai to leave Virat and always takes the opportunity to focus her in bad light before everyone especially Virat. Her main motive is to eliminate Sai from Virat's life. For that she doesn't even hesitate to use certian manipulative methods.
So what will she get by all this? Samrat anyhow is not around and if she can remove Sai from the picture she thinks Virat will be all hers despite Virat's clear repeated reminders that nothing is going to change between them even if Samrat and Sai are not there with them at the moment.
Samrat might run away because of this delusional stubborn lady but Sai is not the one who gives up. She's firm and clearly knows what she wants and what to do. It's not that easy for Patralekha vahini to bhagao Sai Joshi Chavan!