If a girl told me to delete all the girls off my moby, then I'd delete hers and hers alone and tell her to get fucked. Sounds to me like she's digging the claws in and the further they are in, the further from a life of happiness you'll be, because
a) she sounds like a nut bar
b) she sounds manipulative and controlling
c) she's older and needs to grow up
Is she allowed to have blokes numbers?