Anyone could plainly see that there is absolutely nothing in this world that they want more than each other. The way his lips form into a smirk whenever she's around and the look she gets in her eyes when he talks to her, like he has galaxies in his veins and the universe at his fingertips - all of it just screams to the rest of the world that they are undoubtedly and indefinitely in love with each other.
But what's so sad about it is that they are so utterly and irrevocably infatuated with one another that they're completely oblivious to the fact that the other person feels the same way. They're too busy being horribly terrified of being heartbroken to realize that their hearts are already in each other's hands.