While scrolling through Facebook tonight I saw that Hayley had shared an article "The Likely Cause of Addiction Has Been Discovered".
I clicked on it and started reading. It's a really long article, so I haven't finished the whole things, but it makes sense so far! During my first session with Grace she asked me how I quit cutting, my answer was simple, I moved out of the negative environment! When I was stressed, overwhelmed, or depressed the urges would come back. When everything was fine, even while I was cutting, I had zero desire to cut!