Arnav will break Sheetal's fast - this is expected...ASR does not believe in rituals...he said to Khushi do not act like other wives...he does not want Khushi to act jealous etc...he does not understand significance of karva chauth what it means to a woman or Khushi if Khushi does not speak up or tell him...moreover he is pre-occupied with Aarav's feelings right now
Its not that he does not love Khushi, he will do it coz he will see Sheetal fainting etc...he will expect Khushi to be ok with it coz he did it only coz he saw her fainting without any feelings...like always Khushi has to accept the way he is
Only when ASR/Arnav see tears in Khushi's eyes will he understand her feelings...else he overlooks/ignores...him hurting her comes first loving/caring for her only comes out of realization that's the way he is...what he wants/feels comes first Khushi comes next
Be surprised and happy if Arnav does anything different to his basic nature...enjoy maha episode !!