I'm so sorry, I know this hurts you. It sounds like she's been thinking about this for awhile. You can't argue your way back into someone's heart.

You deserve to be with someone who meets you at that commitment level of mutual respect, understanding, harmony, friendship.

I recommend the following books:

Getting Past Your Break Up by Susan Elliott. She also has a Youtube Channel. She encourages everyone to look within, take personal inventory of their relationships and their life while dealing with the grief from the loss of the relationship.

https://www.youtube.com/user/GettingPastYourPast/videos

Another thing I recommend is reviewing the articles on GRIEF here on Psych Central. You may or may not realize it but you are grieving an intense loss, and even though your ex fiance didn't die.. it's a loss and you're unexpectedly having to deal with it.

Hang in there. Move out and begin NO CONTACT.. Trust me, you will feel so much better if you just give the "friendship" she wants a break.

Keep sharing on the forums!

Best of luck,
Lele