Art is therapy. It's good that you're getting this stuff out there, and even better that it's producing such beautiful work. It's powerful moving stuff like this that makes deviantart still a worthy hangout.
I've made a series of eight comic strips about the first part of that relationship: [link]
Basically, she used me when she needed support after her mother's death, and when I wasn't useful anymore, she let the relationship rot until I had no choice but to put an end to it. Then she went back to her violent boyfriend, and acted as if nothing happened. I've been on therapy ever since.