To answer your question, there is no way to have sex with a new person while in a relationship and not have the old person find out. If you can lie as well as I can and if you have a good amount of personal restraint, you can set the time that she finds out instead of it being outed accidentally. This is the best that you can hope for.
I don't think you can lie well enough to hide from your new neighbor the fact that you have a girlfriend, though. I think I could if I put a fair amount of brainpower to it, but it would be rough and I'd only get a month or so out of it.
So! If you're really, really horny and care to take your chances, you can probably come up with a good set of lies, repeat them to yourself over and over and over until they become the truth, and screw around with your neighbor for a month while you figure out what you REALLY want to do. Use that time wisely, take a look at both of their habits and personalities, figure out which one you think you have a better chance with. . . .
Or, keep it in your pants and tell the neighbor that you have a girl already. That's hardly fun, though.
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