@Zboss,
Quote:I just am concerned about people trying to take over what I have worked so hard for.
I don't think you are very clear on the girlfriend thing.
Girlfriends are not prizes you have "worked so hard for", and they are not things you own. As you do not own your girlfriend, no one can steal her from her (people can only steal things that belong to you). If she goes with another guy, then sorry, that's life. There are no guarantees in life. After all, who she is with is her decision.
If you have anything, what you have is a "relationship". If you are working for anything, then you are working for a relationship (not for a girl).
The good news is that if you have a good relationship, then your girlfriend will almost certainly stay with you. People like to have good relationships and no one leaves a good relationship for another person. You will notice that when your girlfriend said to you "you have nothing to worry about", she was answering your concern by telling you she thinks you have a good relationship.
My best advice is: don't screw up a good relationship.
But you are going to have to deal with the facts... you never own another person. You should stop talking as if you do. If you have a good relationship, then keep it. Keep working on it, and keep enjoying it.