I am confused too about why Rudra was angry - maybe it was a male ego issue, not sure though. Or maybe he was angry that Pree let his Mom down and broke her trust and that might have brought back the memories of his brother and how his trust was also broken, which further fueled his anger. 🤔
I think it was less about the necklace and his mom and more about her and yuvraj lol When she kept on explaining about yuvraj and the hug in the car he kept on getting angry and then said how can she be with her lover around the families and another man lol It might not be jealousy but his ego and the fact he was judging her for being with another guy did effect him. Already he judges her for her supposed affair with his bechara brother lol no blame for him but preesha is the big bad wolf here who traps other men lol He already thought bad of her so him getting extra angry was like why do you care dude lol