I was having no-contact with my sister after our relationship turned too toxic to be managed by both of us

She accuses me to be emotional but then she is the first to break the no-contact rule casually out of boredom to say things like "i am bored let's have a walk somewhere"
I hate this complicated situation
I wish I was more mature when young to avoid this bitter end

She is the oldest and more financially stable, but lately she is alone. I am also alone but don't want the disorders of the past
I am trying to stay sober

She makes me nervous and unstable and once she has used me, she goes back to her activieties and old contacts