Sairat OS- When she returned after years

Sai and Virat had a huge argument regarding making Pakhi their child's surrogate mother. All in Chavan Nivas wanted it but Sai was firmly against it. She said she will not go through the process if Pakhi has to bear her child. She also suspected that Pakhi has to do something with her report which says that she can't conceive again. She actually blamed Pakhi for this and accused that Pakhi wants to get Virat by hook or crook.

Obviously Pakhi cried and denies all these and everyone was sympathetic towards her and Sai was the velain in everyone's eyes. There was only one exception and that was Rajiv who believed Sai. So one day after a huge faceoff Sai left Chavan Nivas after signing divorce paper.

After 1 month of Sai leaving Rajiv proved that Sai was innocent and right at her accusations. Pakhi really asked her doctor friend to do Sai's wrong treatment and make a fake report that she can never conceive. She also planned to make everyone against Sai and throw Sai out of the house and take the position of Virat's wife. Pakhi was thrown away from home and Virat made sure to put her behind the bars to conspire against Sai.

Virat regretted his actions and tried to find his Sai but she just vanished. He went to Garchiroli also but she wasn't there. He started to live in Sai's memories only and turned their room as her memorial. Everybody of Chavan Nivas regrated and prayed for Sai's return.

What happened when after 3 years Sai comes back to his doorstep and why.