Quote:
Do you not feel the same because you're past that and now bored of her or is it because you haven't been together long enough to develope a deep love for her?
I'd add to this: Or are you not looking for love right now?
If you are becoming bored with her or you're not looking for love, I'd say you have to cop to it and break her heart a little bit now to avoid breaking it a lot more later. "I think we've grown apart" and "I think we're looking for different things" are both painful conversations to have, but they're a hell of a lot better than the alternative. (I had a girl lie to herself and to me about her feelings up past the point where we were engaged to be married. It sucks. Don't do that to anybody.)
If you just don't feel it yet and you think that you might, a gentle, "Shh. Not yet" is kind of bittersweet, but again, it's better than the alternative. If she's going to drop you because your feelings aren't at exactly the same place that hers are, then you'll be doing yourself a favour.