IMO, its only Kabir and Tarini who know about this truth. I am sure Shreya has no idea what this is all about, for if she had the slightest of hints, she would have used that to break their relation long ago. She would never have needed to seek help from Manav. So if Shreya indeed sends this letter to Ananya then who has told Shreya. My first guess would be Tarini ...is she double-crossing Kabir by being Shreya's alibi or is she playing a game of her own.
Coming back to the episode, it was brilliant. Malvika finally redeeming herself and distancing Manav. Manav speaking of a dhamaka the day after the engagement that would complete the hat-trick for Ananya. This was like premonition of things to come. Ananya giving a cold shoulder to Shreya and without a thought refusing to wear what Shreya had gifted. Ananya finally realising in bits and pieces that Kabir was indeed right about Shreya being smart and manipulative. What I really did not like in the episode was Tarini helping Kabir get ready by buttoning his kurta etc. Tarini should now step back because this is bound to create problems later.
Why does the falling of photo frame of a dead person considered a bad omen ? Does that mean SK is alive ?