Is it wrong to fall in love with your best friend while you are committed to someone else, and then leave your partner to be with your best friend?

When you start loving your best friend (only emotional, nothing physical) and then after you realize it, you break off with your current partner to be in relationship with your best friend. Is it wrong?
Is it wrong to fall in love with your best friend while you are committed to someone else, and then leave your partner to be with your best friend?
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