What should I have done in this situation?

Three or four days ago, I started talking to a Listener, and apart from some small no-no's here and there (for example, she asked me in what city I lived), she was a good person. Unfortunately, earlier today we noticed we actually knew some people in common (which is quite probable, my country is a small one) and she said she didn't want to talk to me anymore, and that was okay[Edited]

This led me to recall this person had told me, the day before, she was "bipolar and had trouble sleeping" but, most of all, I felt this was profoundly offensive - the reason why I'm here is to help me cope with the death of my friend, who died a year ago, and who meant the whole world to me - and I instantly blocked her, but... my question is, what should I have done differently?