The movie knows little and cares less about how people fall in love.
As for the rest of the film—which is to say, the bulk of the film—I think it offers up at least three disturbing lessons about love. First, that love is overwhelmingly a product of physical attraction and requires virtually no verbal communication or intellectual/emotional affinity of any kind. Second, that the principal barrier to consummating a relationship is mustering the nerve to say “I love you”—preferably with some grand gesture—and that once you manage that, you’re basically on the fast track to nuptial bliss. And third, that any actual obstacle to romantic fulfillment, however surmountable, is not worth the effort it would require to overcome.
And therein lies all my problems with all romantic comedies (be they movies, books, or tv shows) that have ever existed. It’s an escapist fantasy (which you guys KNOW I am into), but dangerous in that there is just enough of a veneer of reality to make us think we might be the exception.