Neither of them.
Ovi was never in love at the very first place she was only obsessed with Arjun. Because of her obsession and possessiveness she got hold of Arjun through wrong doings especially on having a deal for the happiness of your own mother!
Purvi is a over sanskaari girl. She had the love in her for Arjun as much as Arjun has for her but was too shy to show it. She feels that it would be termed as wrong if she were to show her love for him. She was brought up in such an environment and to add further, her inferiority complex of being an adopted daughter.
Arjun is a dude born and bread in overseas. He never knew what love was all about till he met Purvi. Her simplicity made him fall for her without him realising it. Love and fear are opposite. The love Arjun had for Purvi gave him the fear of losing her. That was the reason why he always kept asking her for assurance of not leaving him.
LOVE to me is energy. You cannot say I will give 20% of my love to my daughter another 20% to my son and the balance to my husband. The more you give the more you receive from the Universal. This is the ultimate Law. There is abundance to be given. Love doesn't know what is right and wrong. It doesnt have likes and dislikes. Nothing can become foundation of life except love.
LOVE is also loyal, faithful and can be relied upon. It never betrays you. In this triangle of so called love between Arjun-Purvi and Ovi there was betrayal. Therefore it cannot be love instead it is something else.
Lastly, love is ready to sacrifice but love never sacrifices the other.
Hopefully I made some sense here on Love.