If someone asks you if you are mad at them what do you say to them if truthfully you are mad at them but you don't want to tell them the reason because it will create unwanted conflict?

You might say something like, "I appreciate you asking, and I want to be honest that I'm feeling a bit upset right now. I need some time to process my feelings before we talk about it further." This way, you acknowledge your emotions without going into details that could lead to conflict.