I will try to make this as short as possible. Me and ex has a big argument 3 weeks ago, he broke up with me. I work away and within 2 weeks we were still in touch, he was upset at me but he said he was open to ‘sorting things out’ on a particular day. That day came and he let me down because ‘I was being annoying ringing him all the time’ I went batshit crazy, I called him and said he was The worst boyfriend I ever had, and never to speak to me again.
Of course that was in the heat of the moment 
I didn’t mean that, and deep down I wish he’d try to talk to me. It’s been 6 days since the argument, and I’ve heard nothing from him, what is he thinking? Has he thought about me at all:( I’m so confused I don’t know If I should give up or not
It looks like there were at least 2 arguments. One 3 weeks ago and again 6 days ago. If the relationship had several other arguments in addition to these, it’s hard to say if he would want to talk again especially after you annoyed him by calling him all the time and then said he was the worst boyfriend and not to speak to you. I understand it was in the heat of the moment, but you must try to control those impulses! Men hate arguments and want nice easy going girlfriends. It might be that he’s tired of arguments and is considering whether or not he even wants to try and sort things out or even be with you again. And it’s impossible to know what he’s thinking. For now, continue no contact as only time will tell whether this works out or not. In the meantime, focus on you and things you enjoy doing. Work, school, family and friends or whatever…
How long were you together?