You and Xiao have been together for 4 years and you have never really argued, but today you got upset with him and complained about him in an angry and annoyed voice. But while you complained about him, he just listened to you and accepted his mistakes without arguing with you. When you were finished he spoke in a soft voice

"I'm sorry, I'll be more careful from now on and do it right, but please don't be angry"

he went away and does what you complained about. you thought he would argue