My ex boyfriend brings his new girlfriend around me , why?

So I broke up w him about a year ago but we work in a same company there always intersections but it was all okay we were staying friends after brake ups. He wanted to get back together but then I made sure I don’t want anything else but just staying good friends. Suddenly he has a new girl and it was tore okay that he never mentioned that to me but things I can’t understand is that if he wanted to bring his new girl to work and showing everyone wasn’t something I expected at all. I told him if he meant to brings he around common area he should have told me that and if he never even mentioned about his new relationship to me and still always try to flirt with me he should have never brought that new girl around our common area and especially to work? Even after I told him if he could show me a little respect I’d be really appreciated and I even told him that I was really happy for him I was not rude or controlling or anything like that and he still brings the new girl around out common area? What possibl reason he would keep do that? This is just really annoying
My ex boyfriend brings his new girlfriend around me , why?
Post Opinion