If you want to talk, be quiet. If you don't feel like saying something, you need to speak out. If you want to pursue him, distance yourself from him.
If you want to argue with him, stop and listen and agree with him. (Validation)
"I am not sure how I feel about that" "I understand you feel that way" "I am sorry you feel that way" "I need time to process what you are saying" "You are right, this is not working for me either" "I have not decided"