Prerna lacks the courage to trust her love. She is blinded by the public humiliation so she will believe any excuse, as stupid as the ring, to not trust what's right in front of her eyes. My dear, find the courage within you to see past the fake hatred and trust in yourself and the love you have for him. You will see he loves you and only you.
Anurag lacks the courage to trust his love as well. Literally Komolika has done nothing to hurt Prerna so far to justify his concerns for her safety. My dear, why do you think you can't protect her from Komolika when literally the goons had your love at gunpoint. You fought them all and saved her (and your child too).
I don't doubt the love they have for one another but it is not enough to overcome their Kasautiis. The biggest villain in their relationship is always going to be lack of trust.