Angad planned a whole surprise divorce for Sahiba simply because he thought she would file first. When he wants to take revenge he does it , he is full of hatred for anyone who hurts him or his mom. Similar traits in his son. But son will mellow down with time or trps.
This. Angad will punish anyone hurting him or his bloodline. Diljeet doesn't seem to be the type to truly scheme revenge. For all that Angad had done to her, Sahiba was unable to give him even a single slap. She doesn't seem to be hating him at the moment, but he detests any mention of her. The only thing she fears is Akir finding out he was rejected by his sperm donor. I suspect that they are showing this to compare Akir with Angad. For his mother, Angad will attack anyone, and the same is true for Akir.