Why isnt he calling back?

I was with my man for 3 years. I broke up with him 12 days ago on hois voice mail because he would not reyurn my calls from a arugument we had. he has been non attentive and selfish. ( mind you he lost his job he has been in & out odf depression) he never returned my call even when I left a message saying it was over. Why has he not called me back I miss him but not the bs. I'm so worried...