Isn't it obvious with what has been shown of her till date? Abhi is not her love, but a competition that needs to be won. Arohi weighs her own value by her wins, and for her marrying abhi alone is a win for her... a trophy to show the world. That also means she is incredibly short-sighted, because the feeling of winning is always temporary as there's always a new challenge to overcome in life, and people who think they always have to win to have self-value have to maintain a wining streak. Arohi winning abhi by marrying him would be only a temporary win, because she would realise going down the line that she won a small battle by marrying him, but lost a war and became a casualty, as she will find herself stuck in a loveless marriage and eventually whatever feelings she thinks she has for him will turn into frustration and resentment and she herself would no longer want him.
Arohi is overconfident that abhi would easily forget akshu and start loving her instead.
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