Jen I have no idea what the story is behind all this but as with all people that we love feelings get hurt very easy. Maybe this is just a bad time in this other persons life and they are letting their anger out on you. All humans have a tendancy to get very angry at many things and then one small thing said or done by someone you love and trust seems to cause the volcano to erupt! I think that is because you trust that person enough to let your feelings out and they end up catching the brunt of lifes problems.
What makes you so sure that it is you Jen? Maybe you did something to agitate this person at a bad time and a mole hill became a mountain. Don't be so quick to blame yourself. Even if you did something horrible to this person all you can do is apologize and a true friend would try to understand whatever happened. I find it hard to believe that you could do something that bad to anyone!
Hang tough Jen and quit beating yourself up. It sounds like you are doing everything possible to get to your inner self and deal with your feelings so IMO the next step belongs to your friend.
Nobody that does as much good as you do can be as bad as you seem to think of yourself! Don't ever forget that in the end we answer to only one and He knows your heart.

{{{HUGS}}}