My heart aches for the both of you. For Sarah, I understand her completely. I too was raped as a teen and to tell you honestly, you never truely get over it (at least I havent) and intimacy with my husband is still difficult. At times I feel dirty and ashamed and physically ill. Nothing to do with him but my past. For you I feel bad for because your love for her seems so genuine and honest. She probably has never felt such feelings in a relationship before and this is where I have to agree with Ozzie. Sarah probably beleives in her heart that she doesnt deserve the goodness that you have provided her because she has been hurt so badley.
I agree with Shadow and her post as well. I am sorry that things ended this way for you. It is not easy for anyone in this situation.

Hugs to you and to Sarah,
Jen