Yes, i feel that Thakur had accidentally killed Ichcha's father..and Pushkar is blackmailing him for the same now and then.
Plus, it seems that in order to compensate the loss of his life, Jogi Thakur had handed over lots of money to Pushkar to search for the dead man's family and compensate them...
But Pushkar, being the evergreen corrupt hungry devil, he had kept most of the money with himself, and gave Damini just a bit of it...and that too with a false story of her husband being a murderer and convicted to jail term....so that out of fear and societal pressure, she does not try to search for her husband or rake up the issue.
Now, seeing both Damini and Thakur under the same roof, he fears that some day his secret of having taken all the money in her name would come out..so he wants her out of the home as early as possible.