Why is he getting angry that his ex hasn't contacted him?

Should I leave? He was deeply in love with her and he broke up with her because they were fighting a lot. They were together for 2 years and lived together. I am only talking to this guy and he is super angry she hasn't contacted him and they have been broken up for 11 months now. There hasn't really been a no contact period and it seems that she is really going through with the NC this time. If I got angry that my ex hasn't contacted me it would be because I am still in love and truly never wanted to breakup. He told her he never wanted to breakup with her but did because she kept doing the same shit. Here I am talking to this guy am I just a rebound? Please share your thoughts!
Why is he getting angry that his ex hasn't contacted him?
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