what could arnav's problem is with having a child? he is ok with kids around, what scares him is having his own kid or rather emotional connection with a child. He made that explicitly clear to lavanya and i got the same feeling when he refused to be guardian to Leher. atleast thats what i understand. So here is my take on this
I think Anjali lost her child in some way. She was so emotionally attached to it that she went into severe depression. As Arnav mentioned her husband was not present or was careless so he might be catalyst or not present to help her or in a way responsible but somehow Anjali couldn't take that pressure. I think she committed suicide and hence this phobia of Arnav to get emotionally attached to a child. He might believe what if he also succumbs or he might blame that child for anjali's actions.
He mentions even anjali di did not choose him. he mentions he let her down, he couldnt help her etc. he might have asked their family to let her come home or to mumbai for change, they might not have agreed and hence the fall out with family too
Plus the Oct time when he goes to annual trips coincides with big puja at hometown. I think it might be Anjali's barsi. he makes sure he doesn't attend that. Hence Khushi never went with him on these trips. Even Akash alludes to it saying this time of year u are always vulnerable and hence Khushi will understand. That's why Khushi also wanted to stay behind this year. Thats why all those adrenaline fueled sports like bungee jumping to get a high so he can forget this time of the year
Reminds me of Arnav of IPK when he used to go away during his mom's birthday.
I guess all the root cause is with Anjali and her child
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