Hey, sounds like you were honest, and you did do something productive with the session and were able to tolerate it.

My "safe" therapy topics, useful for when I cannot tolerate the real stuff, is my relationship with my mom and my ADHD son's situation. Work is also a good fall back topic.

Next time you can say "I keep thinking that I don't really trust you yet, even though I found myself able to share some very personal, painful information."
Then you can go from there, talk about trust!