Your mind races...and you can't deny that you're really thinking about leaving her here. She's undeniably a danger to your safety and humanity. You remember movies like "The Howling", not long after the wound has healed, they're changing into werewolves. Sure, it seems like the curse has a bit of an incubation period in the movies, but it's still not the safest idea to hang out with her. It's not a question of IF she'll transform, but WHEN.
"Becky," you begin, ready to tell her that you ought to split up, but you see the fear in her eyes, which are welling with tears. You remember her being the first person to befriend you when your parents moved you to the town, the times you'd laughed, the times she'd comforted you after yet another relationship gone wrong. "Becky," you begin again, steeling yourself to ditch her. More thoughts flood your brain. Thoughts of the good times, when you'd gone to Disney World together, and when you'd gotten drunk together while her parents were out of town. "Becky," you say, hesitating again, remembering how she'd been there for you when your dog had died, and when you'd consoled her after her grandmother had passed away.
Becky is on the verge of tears, knowing what you're getting set to tell her, "I know, Jenny...I know," she says, her voice hitching slightly as a tear rolls down her cheek. "So..umm...I...uhhhhh...guess this is it, huh?" she says, struggling for words.
"No, Becky, it's not," you reply, struggling yourself not to break down and cry. "I'm not going to abandon you. Somewhere in this fucked up place, there's a cure, and we're gonna find it," you tell her defiantly.