I don't wanna talk about the story because everyone here has talked about it.
Rather I will talk about what this story made me realise.
This story made me realise that the LOVE we have is never for the another person but it's always about what we feel within. Another person is just a thing to which we react and generate love within ourselves.
And it's about how we feel when we are with the other which makes us fall in love with the another.
Dia had an opportunity to live with her first love. Instead she chose to love with her 2nd love because that's what made her feel great and loved within herself.
This isn't right/wrong but it's just human instincts.
This kind of takes spiritual route but this is my honest opinion.
(I take all the right to be wrong)
(BTW movie is awesome)