The purest expression of Love in Tolkien’s works is following
Sam follows Frodo into Mordor. Arwen chooses to follow Aragorn’s fate instead of the one she was born to. Amroth will not leave Middle-earth when Nimrodel cannot follow. Sam, Merry, and Pippin will not let Frodo leave the Shire alone. Beren and Lúthien follow each other into the darkest places in the world, or rather Beren goes, alone, repeatedly, and Lúthien pursues him with the same fervor that he once used to pursue her.
Tom Bombadil follows the river to find Goldberry and once he finds her he’s always following the path home to her; the only paths in the Old Forest that are dependable and constant are the ones that lead to his home and to Goldberry’s pool. “I have my house to mind, and Goldberry is waiting,” for him to follow her home at last.
Gimli follows Legolas and Galadriel into the West, and bears a love so powerful that he is the one exception to the rule; he bore no ring and yet is welcomed for the sake of his love for them. Sam swears to return to where he thinks Frodo died after the duty is done, but in that moment, the hardest thing is not the weight of the Ring or the fear of Sauron, but the burden of leaving him. Éowyn and Faramir stand together on the walls of Minas Tirith as they wait for the end. The Three Hunters push themselves to near impossible feats of endurance pursuing their friends when they are in danger. The ents constantly followed the entwives to their gardens, even though they didn’t care for them much, and the story goes that one day they will follow them and find “a land where both our hearts may rest”, a place where they can both be happy.
They go only because they would not be parted from thee – because they love thee, Éowyn whispers.
You can trust us to stick to you through thick and thin – to the bitter end…. But you cannot trust us to let you face trouble alone, and go off without a word, Merry scolds.
Don’t go where I can’t follow, Sam weeps.