Great post Sush๐ค
True, everytime Khushi lays her eyes on Arnav's chaak girebaan๐...the guilt that she is responsible for the angry red scars assails her and makes her fall for him more and more. See, IMHO, the initial level of "falling for each other" had happened long back...at the beginning of the show...else, they would not have tolerated to be within one mile of each other for the rest of their lives...their transgressions against each other were so vile, or should I say their percevied transgressions against each other. The fact that despite all that had happened between them, they could choose to be in the same room at any given moment is very telling. Remember how perturbed ODB was when he thought that she had left for Lucknow...or how reluctant she was to leave Delhi.
This second phase, as you so aptly call it, is for them to realise that they have "fallen"๐