I think Sooraj almost convinced that Chakor leave him.
He has doubts on Imli about her union with KN about Vivaan and why she hiding calling Chakor.
Other than that he feels love in Chakor's voice but still not much affected by it.
May be because he seen more than Imli's words ie Ranvijay as husband in hospital file and all.
He needs to get more clues to realise his thinking about Chakor is wrong.
And Chakor now created her new world with hopes of his return and finding solace in talking to his photo.
Chakor's excitement of hearing his voice is doomed easily by that inspector. Ranvijay is cunning like Imli easily diverts that it's criminal mind that make Sooraj talking softly.
It's clear he aware of things as he shuts the door of that room fastly means he doesn't want Chakor to see photos of KN.
He may be wanted to kill Sooraj first and then Chakor or her
unborn to end KN's family.
In precap,I think Sooraj is helping a pregnant lady to taking water from well.