What do I do then?

A person I am close to has a behavior pattern that used to “make” me hurt when I engaged, but I am working through my Models and I don’t feel that way any longer. I love this person very much. The fact that this behavior no longer gets a reaction out of me has left a void in our conversations. We used to fight about this thing, but for the past couple of weeks I have stopped being a part of it when the behavior occurs. I have simply stopped talking and gone about my business instead. The other person is angry with me for changing this dynamic and I don’t have a clue what to say to explain the shift in my reaction. We are both adults. I am confused about how to react or what to say when this occurs. When I change, the people in my close relationships deserve some sort of explanation or primer about what is going on. Thanks.