Khushi ignores personal problems because she can't stand the hurt and can't let it come in the way of making everyone else around her smile. Arnav ignores his problems because his ego does not allow him to let himself get hurt. They both have put the elephant in the room i.e. their unplanned wedding on the back burner and forced themselves to settle into a "normal" routine.
However, after today's episode, those old wounds have been scratched open again. Considering that the both are going to see another couple being tied into the sacred bond of a marriage, I don't see the problem being put on the back-burner again. Hold on tight! The next week is going to be intense!