I hate to say this, but Preeta is definitely the root cause of her own destruction. As bad as the Luthras/Prithlyn/Villains are, she takes the cake. Imagine how quick she was to inform Rishab of Prithlyn's, without fully contemplating the consequences or with anyone's authority. Even went as far as obtaining proof (although it got destroyed). Where did that quickness disappear to??? Once again, without considering the consequences or given permission, she DECIDED not to expose Sherlyn because Rishlyn 'seemed to be giving their relationship a chance'. Come on now, Rishab didn't communicate that info, and she had already planted the seed of infidelity in their marriage further fracturing whatever was left.
So she exposed Prithvi, Sherlyn's better half, her partner in crime (literally), and spared her??? Assuming she'd be a better wife and bahu although she despises and willingly hurts the family. Now there's a new promo out where Sherlyn and Kareena throws her out of the house, Kritika turns her back on her, Rakhi Ma and Karan are only watching. I knew this was going to happen. I believe that Kritika might resent her a little deep down for always 'ruining' her marriages, even Kareena keeps choosing atrocious partners. Probably...
But knowing the Luthra family Preeta always puts herself in these situations, and we're seeing a weak whimp as opposed to the one who ruined Mahiran's wedding and claimed her rights. I would assume that event would've finally opened her eyes, to see the reality of the Luthras. But nope, she falls back into the same cycle and let's her guard down. Rakhi/Mahesh will always be weak> Kareena/Bani will always hate you> Kritika will always flip flop> Karan will always disappoint you > Sherlyn will always backstab and plot against you > there will always be another potential 'high class' wife and bahu reserved for that family. Sad to see that Preeta, Pragya and Prachi keeps making the same mistakes that ultimately damages their lives/marriages. The Luthras never change and Preeta will never learn.