There is a reason that Humeira is spending night with Ayaan.. Zoya is free now for the night and since AsYa AyRa somewhat do go parallel, it's possible that Zoya runs to KV for the night?
Tanu is in Asad's bedroom.. She probably leaves before Zoya gets there (if Zoya is going to KV)..
Tanu is probably super mad because Asad rejected her yet again and that's why for the revenge she gets him arrested? Maybe she tells that something happened in the night?
See Zoya has to be the savior for Asad--get him outta jail...so maybe AsYa do spend the night together and when Bili puts Asad in jail, Asad tries to testify that he didn't do anything to Tanu that night but they ask him for the proof and we get Veer Zaara type of thingy where he doesn't mention that he was with Zoya all night..and stays in jail... Zoya finds out about all this and without thinking about her honor, just tells the cops that Asad is innocent as he was with her all night and not with Tanu...
What do y'all think about this?
I am just happy that we will be done with Tanu and ZoYan once and for all before the reunion!!!
EDIT:
Actually after I wrote this, I discussed this post with other friends too and now even I am leaning towards Zoya NOT spending the night but accused of it and then Zoya lying about it for saving Asad!