Unfortunately nothing in this world is idealistic and therefore Kumud having a massive ego decided to get married to a drunkard abuser without knowing. I mean Saras said no to her without thinking that she wouldn't wait for his sorry butt to come back and fulfill his promise. These characters are human therefore they make mistakes and the show is portraying the dire consequences our decisions have on us and the people around us. It' s hard to witness but that's reality.