Here is the sequence
Rashmi and arhan met had an affair where Arhaan told her he was married and is divorced
Rashmi said ok
Salman told her he was married and had a kid
She had no clue abt the kid and that shocked her
Arhan told her itās in past he is not in touch with his ex and she has moved on and the kid has a Family
Rashmi being emotional fool couldnāt let go of him and thought since all is over between him and ex itās ok to move ahead
Now she is coming to know that arhan IS STILL married to that woman and thatās what is pissing her off. She didnāt know he was still married and that the ex and kid are still in picture
Hope this clarifies and that is why she said she is not the sort to break up somebodyās home. She thought he was done and over with the ex and kid but he isnāt thatās why everyone is calling him a fraud