Arjun loves Arjun. He was never able to love Maya or even Saanjh selflessly. Both these women gave up WAY more than they should for him. Maya gave up her God, Saanjh gave up years of her life and energy.
Mental illness cannot be "cured" by love. But acceptance and treating the person well can start the process. Maybe if Vadana had at least given Maya a "Chance", things may have turned out differently. But she didn't, and Maya acted as she did in the past, played games and took revenge. As soon as she feels threatened she attacks.
Arjun was flattered by Maya Mehrotra's love for him. His head was turned by her beauty, charisma, go-getter attitude and not to mention her wealth and lifestyle. From a photographer, he became a CEO. But now he knows, that there is always a "Price" for everything and the price of being Maya's husband is too high. Too bad!