Final answer:
In the text, Lassiter confesses his profound and consuming love for Lila, which transformed his life and identity.
Step-by-step explanation:
The character in love with Lila is Lassiter. The passage reveals Lassiter's deep and fervent love for Milly's sister, Lila. He describes a profound change in himself due to this love, indicating that it is something powerful and consuming. It is this shift from being a lonely man to one who is constantly thinking about Lila that underscores the depth of his affection. Lassiter's love is transformative, shaping his very identity and life's purpose.