It's perfectly normal to wonder these kinda of things,
people are, by nature, curious. So if you're feeling any grief because of
your feeling just know you're not alone. (:
I agree with rubylois, if you continue to feel this way then maybe it's best you
see someone new. If you love her a lot and don't necessarily want to
be away from her then I suggest taking a break from that relationship.
Look for someone if you do, when you find someone if you feel like you
miss her then go back. Maybe the feeling would be satisfied and it
would stop?