Guys, all this needs to happen for there to be a dramatic twist in the show...
Kaajjal will say Yes, out of spite or whatever reason, but she will say yes. And Dev will not let any of his family speak out the truth.
My prediction.. close to the wedding day, or even on the wedding day, the truth will come out and Kaajjal will save Dev's life by marrying him. It's HAS TO HAPPEN, since that is the only way to save Dev.. and by some miracle, Kaajjal will not die either after all her Ghannu Bhaiya will be there to save her, even though she has lost faith in him right now....
Just think when she finds out the truth behind why Dev did what he did, whose shoulder is she going to cry on, duh... Ghannu Bhaiya.
So, be patient and positive, Kaajjal is incomplete without Dev and he can't just die!