To expand on this further, because for some reason it's really fucking interesting to think about:
I would take up the role of an emotional mediator. I would either lie and say I didn't create her on purpose, but that I'm happy she's here, or modify this entire scenario so that it was a spontaneous thing "out of thin air" as opposed to an on-purpose cloning.
I'd try and be as accommodating as possible and give her someone to confide in -- try and help her to find her niche in the world, being such an irregular existence. I'm sure I'd become sexually attracted to her eventually, but I am a pretty friendly guy IRL (seriously) and I'd repress my inner urge to rape the hell out of her because I'd probably scar her considerably. I'd have to try hard to imagine and predict my mindset as a female... which would be difficult.
I'd also try and spend as much time with her as I could, in order to forge a strong relationship. I'd sure as hell be a lot less bored, that's for sure. Oh, and sharing my computer would fucking blow. But yes. Whatever happens from there, I really don't know.