Intuition and Practicality

Intuition and practicality-- two ends of a spectrum.
Intuitions, an instinctive feeling rather than concious reasoning. Practicality, the aspects of a situation that involve the actual doing or experience of something rather than theories and ideas.
We often come across various situations in our life, wherein our brain and our heart are the main choices, and more often than not, the heart plays a role of a protagonist with a very antagonistic character. A confusing oxymoron.

Let me, take the example of the movie Kal Ho Naa Ho. SRK, a dying man chooses to be practical, rather than follow his gut. He chooses to let his lady fall in love with another man; in this way hoping that, even after he dies, his lady is left with warmth and love. Wow, what an ending, truly touching. But let's say, he survives. Let's say he was a dying man who got cured and is cured of his disease. Now what?

Does he fight for his true love and try to win his lady back, who he loved so much that he chose to keep her happy and warm even after his death or does he let her live happily with another man which ofcourse were the results of his own hard worked actions and choices.
If he does choose to get her back, does that make him selfish or is he justified?

Many a times, we too face such decisions in life, wherein we choose one over the other and soon, the initial antagonist turns into a protagonist, that is, we  choose to act with our heart and later decide to think with our brain or vice versa.

Are we justified to make such switches? Or is it our right, irrespective of who else is involved and influenced by it?

A small thought, but my mind continues to wander when I put my thought into this.