I don't know if you have to see this person regularly (in which case it makes a difference), but if not, you may not need to deal with that person at all. It may be better to focus your energy on the area over which you can have more influence, namely, your OWN life.
I had to learn this, to walk away from a needy friend who was not helping himself, and who only wanted to suck up energy from me. He was not actively pursuing the help he needed for his mental health, and it was starting to drive ME insane, and I had to pull away from him for the sake of my sanity, because without my sanity, I could end up being no good to anybody.
Are you someone who believes in being kind to others, and being loving towards those who are hurting, and who feel abused? Then you need to nurture and be kind to yourself now, because you are the person who needs reassurance, love and kindness. Look actively for the beauty in your body, mind and heart, and actively focus on liking those likeable parts of yourself, enjoying who you are, relishing it and reveling in it. This is not an act of vanity but of joy, gratitude and mercy. Once you have these qualities, you can eventually become the source of these qualities in others. And your joy will multiply, and you will have been healed.
_________________
When I must wait in a queue, I dance. Classified as an aspie with ADHD on 31 March 2009 at the age of 43.