Ok Kunal was sure very much hurt by Siddhi's behavior and words.
Most cruel was Sidhdi saying, "hamar rishta khatam".
Ok I give him that. Siddhi didn't want o see his face and Kunal was just emotionally vulnerable so he couldn't take chance of being rejected by Siddhi again.
But still not for Siddhi but his child's sake; Kunal could have still gone to prison, not meet Siddhi but inquire about her health. During 4 month period, time to time he can go to prison and ask if Siddhi is alright, how is her delivery going to take place, is she experiencing any issues, etc. Obviously Siddhi being in prison, Kunal can claim custody of his child.
I do not doubt that Kunal still loves Siddhi but such scenario would've helped us maintain that Kunal's character is not completely butchered. it appeared he forgot everything about their marriage and was simply grieving on their last encounter. The love would have been more apparent but No why keep such wonderful character consistent and dignified. Once they decided to assassinate it by bringing Richa in, why leave any room out?
So no worry, future is no better. Severe damage is done in viewer's mind and I don't know how CVs can ever compensate for that. But wait, this is not it. More shame is yet to bring on Kunal by gettign him hooked to Richa and much more.👏👏👏