The bottom line is it doesn't matter what her diagnoses are. You want to end the relationship, so end it and heal. I'm not sure why you sent this in text like that if you live together, that would be upsetting for anyone... and why you posted the text here, it seems attention seeking and inappropriate that you posted the text here and also even sent a break up text with someone you live with. It all seems like a powerplay on your part... because all you had to do was sit her down at home and tell her it is over and decide for yourself what your next steps are to get away from her.

It's clear you're done with the relationship, and if she's been abusive, rightfully so, but doing this in text is weird to me, clearly that will trigger her and increase the risk of it being a difficult break up where she wont be calm and will be angry (rightfully so since you initiated a break up in text).

Make sure when you exit this relationship you stay NC, or else you're being just as shitty to her.... I'm getting some not to good vibes from your tone and how you're handling this, and your behavior... so I'd take a hard look at yourself in this situation.