Virgil is hurting. He can't take the blaming and angry words and hateful glares from the light sides. He doesn't believe Patton's kindness is genuine. The Prince's disapproval has finally breached his defenses, finally crumbled his walls, and now Virgil is done. Logan's completely logical reasoning why Virgil wasn't necessary was true, and he knew it too. Virgil was done with the light sides' cruelty, and when Thomas agrees that Virgil isn't wanted, Virgil breaks.
The Darkness has found its prey, and it's time to go hunting.
Virgil believes that he only makes Thomas's life worse. He doesn't eat because he doesn't think he deserves it. Roman makes it his mission and help Virgil realize he is perfect. Things happen and bad choices are made. Will Roman and Virgil break each other?
(Please don't judge my description writing skills. Oh, and the fanart is never mine. I can barely draw a straight line.)