[Blarg]

Most cats know right away who is a cat person and who is not. They tend to pick up on those things lightning fast and act in accordance before you even realize anything has gone wrong. You may not have to do a thing to get the cat to stay away from you. You may even have to work hard not to have it get up and move away when you sit too close, in the living room or such. Your worries are probably a little exaggerated here.

Barring a cat just following it's instincts naturally, the spray bottle is a good idea, especially if you do it when the cat can't see it is you. Just give them the general willies about being in your room.

Don't go out of your way to get the cat pissed at you, or you will find it peeing on your jacket when you lay it on the bed, etc. They retaliate, even if you're just thinking it.

But your hopes of keeping the place free of cat hair are unrealistic, too. Even people with dead noses can smell a house that has a cat in it even if the litterbox isn't even indoors and the place is immaculate. Their smell can almost vanish if you're used to it, but if you're not ... you and your friends will know it's there. Don't expect your girlfriend to be able to eliminate all traces of the cat's presence.

The allergies to cats supposedly come from the proteins in their spit. This means that if you have one of those cats who is a sloppy wet licker when self-cleaning, it'll be worse, and that if you see the cat doing so, you might want to stay out of that area for a couple hours. It also means that if your cat gets the occasional bath, it might very well help, as it washes away the residue of all those spit baths.