What actually makes an AI girlfriend feel less repetitive?

ve tried a few ai girlfriend apps and after a while the conversations can start feeling pretty repetitive

im wondering what everyone else thinks actually makes one feel more natural. is it memory, personality, better responses, or just having a character you actually like?

ive been checking out crushly lately and i like the more relationship-focused approach, but im curious what other people here think actually makes an ai companion worth sticking with

what matters most to you?