Dev's role ... contradicts

Why so much contradictions with Dev role alone ??

When leap started we saw this Dev who literally had a scorpion tongue on his mom.

But when he had come to know that his wife and baby were not allowed one and only by her mom also ...
he was like talking slowly patiently with Ishwari... but so much fire on Sonakshi ... he knows that she had inhospitable uterus ... Anger and frustration only on Sona is not fair always

Hope CVs show Sona six year struggle too ... as they always showed Ishwari struggle to bring up kids .