"How can you say that that's the case?"
"Or maybe you did something that made her hate you so bad enough to leave you. Maybe you harmed people close to her? Maybe you were insensitive and very self-centered. Those traits count and I figured it is important."
"I did nothing. I loved her the best I could, so I don't understand why she had to turn her back on me and hurt me that way!"
"Maybe for you loved her enough but for her, it wasn't."