My brother is a narcissist

Under a post about narcissism here, I found a couple of comments that really made me think someone knows a lot about it.

My brother is a diagnosed narcissist and playing the victim for 20 years made me walk on eggshells for too long. He also tried to belittle me anytime he could. I love him so much and all my life I did things for him, he did nothing but still he condemned me for a few mistakes I made along the way.

He also manipulated me but lately I stopped listening to him and I started seeing what he was doing. I felt guilty all these years towards him and now, after he insulted me over literally nothing I discovered his diagnosis and distanced myself from him.

Even though we are not seeing each other I still feel guilty for everything I do. For example today my parents came visit me and I wanted to post an instagram story but I felt guilty cause I thought he could be sad seeing it so I didn’t. Then I remembered the situation and posted it but even if I started doing things anyway I still feel guilty.

I’d give a kidney to him if he needed one but I know he wouldn’t and this breaks my heart.

How can I recover from this and not feel all this pain? My therapist says I’ll get over it in not a long time but still, I don’t want to lose my little brother.