In Yesterday episode, We saw that Kunj wasn't ready to send Yuvi away in a mental asylum even though he hurt Twinkle. It's good that Bebe was with Twinkle and she supported her.
But what we are forgetting here is that Bebe also told Kunj that whatever he is doing that's because of his GUILT. Bebe literally spelt it out for the audience that even though Kunj knew what's happeneing is completely wrong, he cannot help but blame himself. It's like a chain reaction where Kunj thinks whatever is happening to everyone because of Yuvi, he's the cause behind it. It's like he's thinking that if he wouldn't have hit Yuvi, Yuvi wouldn't have gone mad and wouldn't act like the way he's acting now.
Kunj is a person that is very responsible and caring. And right now his guilt is telling him only ONE thing and that is Yuvi is HIS RESPONSIBILTY. Kunj has made his life's mission to take care of Yuvi until he's all well. And that's because he thinks he's the reason Yuvi is suffering. So as a character we've been seeing from the start of the show, the way he's behaving now is actually acceptable.
If at all he wouldn't support Yuvi and be like Yuvi's not my responsibility, Yuvi deserves it... Then it wouldn't be Kunj but someone else.
P.S : Sorry if I offeneded someone, wasn't my intention. This is just my POV!
Love
TJ