This film is about the first blossom of innocent love, especially (but not necessarily) in youth, and what a great and terrible risk it is to love so honestly, and so deeply. This kind of "falling in love" is a luxury and a gift that many people never get to experience, so it should be cherished as a luxury and a gift.
The primary couple learns how fascinating it is to be attracted to someone else, yet be even more enthralled by the mystery as "the winds of heaven dance between us," quoting Khalil Gibran on the excitement of getting to know one another at a time of our lives when we haven't yet made up our minds about everything so neither of us can be totally known to one another, because we are not yet totally known to ourselves. Some would say that in the early stages, romance can exceed lust, but I say that the sex is the magnet, and the romance is the dance and the creation of something lasting.
I won't say too much about the plot, so I don't give it away for first-timers. Suffice it to say that any time a couple is in love, what they create is their own private paradise. If they take the easy way out by not dealing with external life issues when and how they need to, or by not dealing honestly and courageously with issues which should be constantly shared and worked through WITH one another, then they run the risk of their private paradise of love getting watered down, pulled apart, eroded, or even, sometimes, totally misplaced.
I understand the reviewers who expressed denial that anyone could be so happy, and anger that anyone in love could be so careless, and callous about why the main couple held on to their true love when they each had someone else who loved them completely. Yet the story ends up being not only believable, but in some ways typical. Haven't we all done things that unnecessarily, and perhaps tragically weaken our most important relationships? Cheating in a relationship isn't only about giving your love, affection, time, attention, and body to someone else. I, for example, have done none of that. But cheating in a relationship can sometimes mean cheating the relationship by not being willing to fight enough, or cheating the love by not respecting oneself enough to say no to the other person. As another reviewer wrote, love is...complicated.