"That must feel terrible to think that" "I'm sorry that you feel that way" "I didn't mean that in that way" " Do you feel (X,Y,Z)?"
Sorry K but for the readers at home those statements above are not very good validation examples.
I can see that you are very upset that was not my intention. Here's what I'm hearing you say. You feel unappreciated. I guess that must have been hard for you. I can see you are making an effort. I can see how hard you are working.