how do you deal with people who treat you badly and then blame you for the way it makes you feel?

this person is a really rude person. atleast they come off like that to me. according to them the only way to protect themselves/take a stand for themselves is hurting others. they don't think twice before blurting out something really sharp and hurtful even when I am trying to just help them out/don't have any ill intentions. they don't leave a single chance to make me feel worthless and that I don't even deserve something as basic as empathy and kindness.

what hurts more is that I don't treat even strangers this way. I try my best to not hurt others. I try to provide them with a safe space to be themselves. I try to be patient with them. at the same time, I am being made to question my whole existence, there's not a single stone unturned this person has left to make me sad. there's a rude remark about everything related to me. most of the time passed as a joke. every effort I make to make them happy goes to vain. it's just met with indifference and left unappreciated. I try to go out of my way for them yet they won't even lift a single spoon for me and they make sure that I know about it. almost all the conversations and hang outs just leave me in tears.

now when I try to protect myself by avoiding them, they don't like it. they feel like I don't appreciate it/cherish it/take them for granted. which is untrue. I love them from the bottom of my heart but the way they treat me affects me now at every level. physically i feel sick. I can't sleep. it's 4 am and here I am typing this out because it's too much to take and I am really anxious to the point that I can't do anything else.

in their defence, I am a really sensitive person. I get hurt easily. I want people to be soft and gentle to me simply because I am like that to others. moreover I am a bad communicator too. I haven't talked about this with that person till now.

I don't abandon people so cutting them off isn't an option either.