This is a tricky one, since no one in "The Lady of Shalott" admits to being in love. Still, the idea of love, even unspoken love, is so crucial to this entire plot. It's a really old story. Lancelot is the guy or girl you always wanted to talk to but never worked up the courage. Maybe you saw him across the lunchroom, but he never noticed you. Maybe she was in your math class but you never said hi. This is love from a distance, and it's real and raw and painful in this poem.
This poem uses the love story as an excuse to explore a more powerful and crucial theme, the Lady's choice to set herself free, her refusal to be confined.
Although it's never explicitly stated, the poem suggests that Lancelot, in his way, is as isolated as the Lady, and as much in need of the connection and happiness that love could bring.