My opinion, having been through such things before, and current being single? Only time will tell. My conception of the feelings you are describing suggest to me that it could be the "is grass greener" thing going on, or it could be the beginning of the end. It's tough to say.
So why worry about it? Follow the advice above. You're not ready to make the decision yet, and I think we make a lot of mistakes trying to make decisions today that we really can't / won't be ready to make until tomorrow.
As for the lifestyle question: separate it out. You live alone now. If you want to meet more people, maybe moving closer to campus is a good idea...and maybe it kills two birds with one stone. Maybe you find that having more people around to interact with, and not spending as much of your free time with your girlfriend decreases any SO-saturation you're experiencing. But moving closer to campus, and breaking the relationship aren't the same thing.
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You don't love me, you just love my piggy style
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