Ah sorry to hear. That thing about how she still loves and cares for you....well, there are many types of love. Unless you've been an utter bastard (which I'm sure you're not) it makes sense that she will still care about you. And she probably loves you in the same way that she would love a friend.
I would highly suggest you let her go. I also suggest that you distance any friendship with her as far as possible. If you have the same group of friends, then be civil and friendly but don't treat her like a close friend. If you don't travel in the same circles then drop her as a friend. She's offering you second best and it's totally your prerogative to not accept it.
Never regret anything that has happened in your life. It cannot be changed, forgotten or undone. So, take it as a lesson learned and move on.