I think that learning to be open and trust people means taking the risk to do so, and waiting to see what happens. You're right, however she responds, it will help you learn about making friends more honestly in the future. When I started being more open about what I was facing, I did lose a few friends. And it was terribly hard, but the friends I have now don't treat my 'issues' as anything more than facts about who I am. Now I don't have to hide being triggered, I can just say, "I want to leave, I'm scared."

I think it sounds like you were very brave with your new friend. I am proud of you for taking this risk!