this only shows that he has now fully accepted his marriage with twinkle and he feels he has a full right to be able to make decisions for her wellbeing, which is why he is hurt when twinkle is adamant to take part in the competition against his wishes. To some extent he feels twinkle is infringing or taking away his right as a husband that he has over her. Before in their earlier stages of marriage he would completely keep himself away from matters related to twinkle's wishes and desires as at that time he did not consider himself her husband but rather he considered her his responsibility, due to which he felt he did not have the right to interfere in her matters when she wanted to do something and would never show objection to anything she did, saying she could do as she likes. An example of this is her wearing that dress for raman-pinni's anniversary party and dancing with another guy, but now the idea of any guy looking at twinkle is a complete no-no for him and he interferes and advises her against things but tries not to make it look like he is forcing her to not do something she wants as he doesn't want to sound over-controlling.
He felt so hurt by twinkle's actions, but for the first time he was not hurt due to his self-respect but this time because twinkle disobeyed him and disregarded him as her husband. The pain and disbelief was crystal clear on his face. My baby kunj is hurting. 😭 😭