despite noticing, ishwari was hurt with the school thing, he hasn't tried to sit down and talk !
Ishvari has no reason or right to be hurt. Dev doesn't need her approval to open school dedicated to Asha. Ishvari got a company dedicated to her. Dev and Sona are couple. Joint everything. Just like Sona does so much for Ishvari and her faltu freeloading bro Mama & Mamiji, gave job to Vicky, than it is Dev's responsibility to take care of Sona & her family.
Bygones are of those days where DIL couldn't spend a penny on her maika. In marriage it is a partnership all the way. Never 50/50. always someone has to give or be 55/45 depending upon the situation. The whole thing was so rushed for Dev to pacify Sona with school in Asha's memory. If Dev would have asked Ishu, we don't know what her answer would have been.