I don't think they would have lived happily ever after. He would have been very possessive and controlling of her. It would have been a toxic relationship that would be hard for Kiran to leave as we see in the movie how obsessed he is with her to the point where he terrorizes her.
He never loved her. He loved the IDEA of her. It would have been love if he had respected her decision that she does not love him and still wished the best for her in life. That sort of unrequited love would be considered love.
He seemed to have psychological issues and had a lonely childhood. So, I think he felt the need to have an object of obsession that he could focus on to have a purpose in life and to distract himself from the deeper issues in life that he was trying to ignore. This is in no way an excuse for his behavior for harassing a girl and would not victimize him. Unfortunately, there are such men AND women in this world who are like this.
But, SRK's performance in this movie was commendable. I think it was one of the best movies in his career alongside Swades, Chak De India, and Veer-Zaara
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