My girlfriend/fiance of 7 years saids she is not in love with me anymore.?

My fiance of 2 years, and girlfriend of 7 saids she is not in love with me anymore. We have a house together and I love her more than anything in the world. I have always been romantic, caring, give her everything I could, was wonderful, and she saids that I am perfect. She said since we started dating so soon she didnt get to experience things and this all came fast and she wants all of this later in life but not now anymore. All of her friends say they wish they could clone me, and dont understand whats going on with her. We have always been happy together. Years ago, her mom put in her head that she shouldnt settle down so quickly and do stuff while shes young and she ignored that. She saids she is not happy with the way things are right now even with everything seeming perfect. I hope shes just scared and confused, I know I should move on, and I havent been pestering her, but I am so deeply in love with her, my love has only grown with the years, I am very commited to this relationship. I have a really good job, I graduated from college, Im 22 and shes 20. I understand where shes coming from, about living her life while shes still young, but this just came from out of left feild. Im not controlling, she is my best friend and the the love of my life. I have tried to tell her everything I could to get her to change her mind. Shes scared because she dosent have anything, everything was ours together, that I bought. She wants to be more independent. I can't see myself with anyone else and Im scared of being alone. I really dont know what to do, this just seems like a total mind f*** to me. She has a friend, that lives 2000 miles away and she has never met him and she thinks she has feelings for him, but not like what she feels/felt for me. She saids she misses me when Im at work and she loves me and she still kisses and hugs me. I know its not a good thing for her to be doing that if she wants to leave because shes sending me mixed signals. But I cant just kick her out on the street, she doesnt want to go live with her mom, shes a college student and shes now trying to get a live in nanny job. The care she has, I bought and am still paying for, so its not like I am going to give her that if shes leaving, unless it was payed off, I feel like an *** for that, but I have been so selfless and put her before myself, and shes being selfish, I have always taken care of her, her little sister has even been staying with us. Im just hoping she comes to realize that she is making a mistake. Im going to hang with my friends this weekend and try to get my mind off of it, what does any one think of this situatuion, what should I do? I cant just give up, it doesnt feel right, I just dont quit things, quitting is to easy....help!