Till now Dev was knowing only the half truth. Once he comes to know that Sonakshi did come to Dixit mansion after Soha's birth and also about the prenup clause of no rights on child born out of wedlock, he will surely leave Ishwari and start his redemption for all the injustice done.
If CV's do not start Dev's redemption now or make him take a stand for Sona and Soha, I am afraid they can justify his character later on. 😡