Somehow I believe the latter to be true as if you all remember during the scene when she seeks Krish's forgiveness, she says that all this while she couldn't muster the courage to tell the truth where Krish told her right away that he wouldn't have consented to marry her had he knew about her past. That's when she confesses that her respect for Krish multiplied ten times and towards the end touched his feet twice!!
So the problem is not whether is the problem/past is grave enough to be forgiven or not but the way our female lead, Rajni has handled the entire situation. She missed the opportunity of telling Krish on the first night and then second time in the resort when she got to know of Archana's death in ye newspaper. And even after that when she saw that Krish had a lot of doubts/questions in his mind regarding her recent behaviour, then also she didn't come clean. Just because Krish had told her that she can reveal when ever she is ready, so she conveniently assumed that he already knows about her surrogacy though her mother and that he is asking just for the heck of asking; so why not jerk him around.
I say she took undue advantage of Krish's love and faith in her. Now that she has broken his trust, I seriously don't think she is making amends or actually understanding the hurt she has caused to the one person who loved her like crazy.