"I'm sorry you feel that way", after hearing that a few times, it can come off as just being apologetic for the sake of agreeing. It also tends to be taken as a weakness. She knows how you feel, don't keep apologizing, not that you have, but be careful with its use.
I like "I understand why you feel that way" better. It shows that your listening, that you've taken her aspect into account. And there is no weakness in it either.
Theres some positive signs in your story I think. Its not uncommon that it can take 2 years for things to turn. Live life, detach best you can, and give it more time.
