Whether it’s Sai giving away her gift to Kaku or not inviting Virat to her college fest, a mountain is made out of a molehill. But there is no reason to do so. Sai is not in love with Virat (spare me the oh she doesn’t know she hasn’t accepted because only when we get her dialogue or monologue will this be made clear) and doesn’t expect reciprocation from him. Virat is in love with Sai and more importantly, expects reciprocation from her. Because of this expectation of reciprocation, his modus operandi has to be different obviously, like protecting Sai from abuse, not cheating on her with his sister *in law*, taking her out on dates, etc.
Sai may be hurt when he talks to Pakhi but has never stopped him from talking to her. She hasn’t stopped him from pursuing her. She only loses her temper when she is bullied by Pakhi (not to mention how she is responsible for her trauma) and the only shield she has is iterating that she is his wife, legally. But, she made it clearly on the day she exposed Virakhi that he can’t have both, her and Pakhi (exact dialogue I don’t remember and can’t be bothered to re call). She’s not readily available for his whims and fancies.
As for her, she’s focused on herself. Even if she starts liking another boy from college, develops feelings for him in her heart, what’s the big deal in it? From her point of view, this marriage is a farce with an expiration date. She made it clear she won’t be his wife and he made it clear he can’t be his husband and is committed to another woman. If he could be committed to another woman in the beginning of their marriage, why can’t Sai be committed to another now? Everything cannot happen according to his desired timeline, when he wants, Sai has to be his zimmedari and not keep any expectation and again, when he wants she has to be his wife. Reiterating, she is not pursuing him or hoping for reciprocation from him or exerting herself on him.
Their dynamics have changed now and they get carried away when they’re together but most of the times, she doesn’t presume that his advances are those of a husband towards his wife. She believes him to be more of a guardian figure in her life, taking care of her on behalf of her father.