I personally would let this one go.

I recently ended a toxic friendship that had caused me more pain then anything else for well over a year. There were no sexual feelings involved on either side, but this person just didn't have the courage to say they couldn't appreciate me as well as my sickness. It got to the point that they were only decent towards me when I was in a better place and I grew weary of giving my utmost to them and not getting the same treatment in return.

The point in telling you all this is that i feel an imbalance of expectations in a friendship causes nothing but trouble - she wanted more from you then you could give, you're now compounding her frustration with your guilt and the result is that you're now just acting friends, instead I would imagine, really feeling it.

What you do from here is up to you but maybe an important lesson for the future, would be to somehow broach what you want from that person earlier on in your friendship. Even if they do still develop feelings for you the ball is in their court as to how to proceed, they might cut off their friendship with you one way or another but --- at least you won't have wasted time or endured potentially more heartache.

Just my two cents. All the best.