Now that I think about it, Ritesh could very well have been such a loving and sweet BIL for Pratha, who could have been her friend too, but as you said they had to turn him into a jilted lover and ruin his character as well. Oh how I miss the fun loving and smiling Ritesh. His scenes with Rishabh were so beautiful and refreshing.
Why I am not surprised by this development? Rishabh's stupid and impulsive decisions spoiled not one but 2 lives-Reem and Ritiesh.First he suddenly confessed his feelings to Reem right before their wedding and then bcoz of his sudden illogical suspicion switched Ritiesh's place at the wedding altar and married Pratha.
Not only that he advised Ritiesh and Reem to get married to each other as if Reem and Ritiesh were childhood lovers not Reem and Rishabh.
Ritiesh should or could have been just a loving BIL for Pratha and could have been the eyes and ears for Pratha within the Mansin.Instead he's being given the role of a Jilted Lover.
Yes Reem and Ritiesh's plans against Prarish looks unjustifiable but Rishabh played with the emotions of these 2 characters- Reem and Ritiesh cannot be suddenly expected to fall in love and behave like a good married couple out of the blue like Prarish.