It's so good to hear from you. I still remember when you went through that awful time with your former P. I'm so glad for you that you have continued working with this P and that he's so helpful for you. 
As for your question...I'm wondering if your P made something of a misstep here. It sounds like what you needed from him was encouragement to talk about it - to know that it was safe to talk about it and that he believed you. It sounds like that part of his response really helped you. However, it sounds like then he went a bit "too" far, by expressing his personal reactions to what you were telling him. Maybe he thought you needed to hear that, maybe he thought you were ready to say those things, too, and maybe his saying it was his way of encouraging you to express anger - but instead of encouraging you, it's shutting you down, so it sounds like that's not what you needed to talk about, and it probably would have been better for you if he had waited until you expressed those negative feelings first.
Obviously I could be way off base here. I'm just guessing, based on what you described. But I definitely think you should tell your P what you told us here, and hopefully the two of you can straighten it out and get back in the groove of where you were going. It sounds like you're doing some really good work with him!
Hug,
SG