Still having a guy problem..

Me and my boyfriend broke up like a week ago and I really really like him..but we kinda ended with a bang!. We got into an arguement about one of our friends because the friend was mad at my boyfriend and then he got mad at me. So I told my boyfriend you acted like a jerk to * and he said that he was only mad at me because I was his girl. (but the day before this arguement we had a talk about breaking up.) so I told him he’s not like that and wait am I or aren’t I your girl? And he said well I don’t know you tell me? And I told him if you don’t like me and don’t care anymore then no im not your girl. And he said watever you just broke up with me…so cool im finally single. I was upset and out of anger I said thats good for you..im not I just got asked out again. Then my boyfriend wrote back good now I can’t ask you back out and I can start flirting again. And so it ended. I was (am) really angry and upset of how it ended, but I still really like him…and he was being all…retarded, he would pass by my desk and fiddle around on the white board which was right infront of me. And then go to his desk and then repeat the whole thing again…but the whole time he was doing that he pretended as if he didn’t see me and as if I didn’t exist. Then today he like finally turned to look at me but I pretended not to notice…I just kept doing my work…he stared for a little bit then turned around and I don’t know what to do…im mad and I want him to think the break up didn’t affect me, kinda like how he’s acting…but I don’t know…any advice on what to do?