So, today is the day my best friend died three years ago. I visited her grave with her family and a few other close friends about an hour ago, and I realized I can no longer picture her face, or hear her voice. I feel like I am betraying her and I don't know what to do. 

She and I knew each other for 10 years before she was diagnosed with Acute Lymphoblastic Leukemia, but the doctors caught it too late. She died 3 months after diagnosis. 

I just don't know what to do.