When abhi saw aksharas name he felt even kainath is with him. He never wanted to let go of this. After removing he was still holding on to it and dont wanted to let it go.
Akshara realized it. She snatched it from abhi forcefully. As she felt he can not move on with her memories. She made sure to snatch it and crush it. To show this is not the destiny 😆
But kab thak bhagogi akshu ek na ek din toh haar maan na padega