They don't understand zoya at all. In fact they don't understand aditya either
ZOYA: let's see what we know about her. She married a man she loved with a passion. She didn't know him very well but she was infatuated with him. The idea of marital bliss with him and she built a castle of dreams. She trusted him with everything. Trusted him and left her family for him. She did not believe him capable of betrayal
Now she is constantly being told by her father that every decision she's made has been wrong. The man she had defended before her father was proven to have lied to her IN FRONT of her father. She was trying to convince her father that he was her friend and that he didn't love her. That too was something that was rebutted by aditya. So everything she had believed in came crashing around her. So she decided why not just go with what my abbu decides for me? Since I'm incapable of making right decisions.
ADITYA: he's passionate. Everything he does, its extreme. He's too much to handle for most except with zoya where he meets his match. When his wife was found dead and holding hands with another, he gave her no benefit of doubt. He's impulsive.
He is absolutely confident in what he sees. Be it pooja's betrayal or zoya's love for him in his eyes. He likes to push everyone's buttons. He coped with his grief by making sure zoya believed the betrayal. Because her trust in yash made him want to believe in his wife but his mind knew better so he took it out on zoya. He goes after what he wants without thinking too much about it which has only increased since pooja's death because he had everything taken away from.
Both love each other bepannaah. And this is why the show is perfection despite some minor issues. It is a very deep show