That is up to you, I have had therapists Say both ways, No you don't need to ever talk about it and one say that is the only way to heal. I think you have to find someone that will do what you think you need to do. If you need to know and talk about it in order to heal then that is what you need to do.
If you just want to learn to change your thinking on things then do that,let you be the guide, you will know what is best for you, really. Sometimes validations is what you need the most. When I would go into therapy with a memory and she would tell me it didn't matter, I felt crushed. It did matter! It was hurting me and to say that just made me hide even more in shame and hurt.
mj