I'm upset with my partner. I told them something confidential and they went to someone for advice that they know I dislike.
What's wrong with this person?
They're just ridiculously cold towards me.
I can understand your position. Is your partner aware that this person treats you this way? If so, your partner needs to apologize to you.
They're aware. I think they did just to spite me.
It is wrong they betrayed your confidence. You should tell them how you feel and why you are hurt. IF you need a neutral 3rd party it might be good to talk to a therapist since they have to be confidential.