It sounds like you've found someone pretty special. You've been together long enough and invested enough time and effort to know this thing is going in a good direction.
The question you need to ask yourself is whether it's worth it to you to give all that up just so you can date other girls. Is banging a bunch of girls worth you having to start all over with someone else at some point in the future? Only you can answer that but keep in mind there are no guarantees that you'll find another one like her, and in my experience, the special ones like her don't come along everyday. Some people spend a lifetime looking for that and still never find it.
Sometimes people get lucky and they just click. Like the old saying goes, don't look a gift horse in the mouth, just hop on and see where the ride takes you. It could lead to a place that exceeds your wildest dreams. Best of luck.
