Dear Prudence,
During my best friend L’s last two years of life, her brain cancer made her volatile and often unkind. I made a promise to her that I would look out for her socially isolated sister. Whenever I check in on her sister K, she blames me for not being a better friend to L while she was alive. I would have never promised to look out for K if I didn’t intend to follow through. I want to be a person who keeps her promises; I understand that K is probably in the anger stage of grief and hope to rise above. I put myself second during L’s last years, which took their toll on me. My friends say my promise didn’t include causing myself emotional trauma. K has little insight, poor communication skills, and is emotionally closed off, so talking to her hasn’t worked. Any thoughts?