From what you've written it doesn't sound like you manipulated him.. I wouldn't appreciated my T using that word either, I'm sorry :/ In fact, you were quite honest and straightforward by telling him the truth when he asked you about what triggered your depression. It really is up to you what you want to process with him. He should respect that. If you feel like the trauma is holding back your progress, it might be a good idea to at least touch on it. If not, don't feel like you have to talk about it just because your T wants you to. Do what is best for you