His best friend's girl, his girlfriend's best friend, his friend who didn't bear the mark of Kane.
Not always apparent to himself, to others, to her, but he's always liked Veronica: v.1 with the sweet, gentle manner, unlike Lilly (exuberant, wicked) or Duncan (ironic, brooding); and v.2 without the marshmallow shell, her softness charred in a trial by fire, leaving only sharp angles and an even sharper wit.
In life, Lilly overshadowed everyone; in death, she clouded his vision. Her shadow lingers, but now he can see again, feel, hear-- tentative smiles, kisses. Banter.
He thinks he likes Veronica, v.3.