Kajal basically didn't reveal her entire past to Ant. She was a bar dancer and danced again after marriage as a condition was put on her by her former p*** [for lack of a better word]. Ant and Kajal went to a party where they encountered some of the Kajri's [as she was known in the business]clients. Long story short, Ant found out, confronted Kajal and she admitted to her past. He then told her that the only thing that is holding them together was her pregnancy. Had she not been pregnant with his child, he would have thrown her out of his life. I'm sure you are caught up with the current situation based on the updates in the forum so I will not go into that.
Krishna isn't really dead. He was kidnapped from the temple. The robbers that stole the car noticed there was a baby in the back seat so they stopped off at another temple and dropped him off. At the same time, a lady at the temple was praying to God to give her a child and when she opened her eyes....there was Krishna. Raizada family believe he is dead as the found the car totaled. But I don't think he is really dead as he is with the other woman. Just a matter of being found.
Hope this helps!