Why doesn’t Sid stand up for Sana?

When Paras and Mahira were taunting Sana and giving her the jealous tag why didn’t Sid say anything? I feel Sana’s argument is valid that Sid isn’t there for her but expects her to behave the way he wants.

kyunki Sana dont want Sid stand up for her. usse jo chahiye wo de rahe hai, 'ATTENTION'.

and Sid dont wanna stand up for anyone in the house, except for himself.

Because he has no concept of loyalty or friendship. Also because hes an @sshole.

Sana dont need that n doesnt expect that as well!!

Yes her anger was justified but she herself destroy all her efforts by again apologizing to him