How does this connect?

So to Ease my pain of a no Arhi weekeend I was watching old promos when I saw one where it says that Kushi was responsible for Arnav's past. How would that even happen?? Did like her parent's car hit Arnav's mom or something?? DO comment!

WOW! not seen or heard about this promo but than I'm new to IPK. They all lived in Lucknow as kids-wonder if there was some connection? Like Khushi's mom worked in Sheesh Mahal and was close to Arnav's mom and something happend and she knew...who knows they can always add twists since Arnav's last name is not Malik Khushi's parents would not know who he is-if that is where the story is headed...