There's fundamental differences between Paro and Rudra in regards to their parents.
Paro lost both her parents in an accident. They did not want to leave her. They were taken from her without any of their consents. On top of that, Paro was adopted and raised by her mama's family. They loved her and supported her. Even the Thakurian provided Paro with a cushy upbringing and bestowed love on Paro. Paro grew up in a loving and supporting environment that helped her come to terms with the deaths of her parents. Yes she's an orphan and yes its sad. But she's able to move past that because of the support system she had.
Rudra's mother LEFT him. She didn't want to leave him, but he DOESN'T know that. As far as he knows, she left him without a second thought. That is such a damaging thing for any child to go through, thinking that they are unwanted and not worth staying back for. On top of that, Rudra's dad raised him. Rudra's dad was destroyed when his wife left him and he bestowed that destruction upon Rudra. He wasn't given and support or love like Paro. Instead, Rudra's dad taught him to hate, fed him hate, and festered his hatred. Rudra, as another poster pointed out, shut down after his mother left him. He was not able to grieve or anything. Instead Rudra bottled it up and thus his wound is still open. He's emotionally damaged, and he admits that. I don't think the crying is too out of place (well except the crying in front of Paro). Sometimes his grief manages to escape the bottle its in and Rudra can't help but break down. Rudra was not able to get over his mothers death, and Dilsher ensured that he never would be able to forget it.
Yeah he'll eventually get over it. But ONLY when he realizes that his mother didn't want to leave him. Only when he'll opening grieve and let his wound turn into a scar.
I think the CVs have done a pretty good job with Rudra and Paro. Rudra is physically strong, but emotionally Paro is far stronger.