Sorry babe, he's playing games. He is being a selfish nightmare, and it's almost like he's getting off on making you feel as down as him -- that's not your shit, it's his.
Listen, I think the reason you can't get on with your new career life is because your head is so obsessed with what he is doing, how he is feeling, when he will next call, what does that message mean etc etc. I have been in your position, and as soon as I decided to look around at my life, I relised I was so much better off without him. I grieved, I got sad, depressed for a while. But I kept busy, and discovered life again and I'm sooo happy for it. I am a sucess now, career wise, physically, mentally. It was only after I left that guy that another door opened a year later to the guy I love now, and has PTSD, and he always treats me with respect and allows for my insecurities and respects my need for communication.
YOU DESERVE BETTER. Concentrate on yourself. If it is meant to be, he will sort his shit out, but I recommend you leave him for now, and concentrate on yourself -- he's making you feel like shit and you don't deserve to. Take some responsibility for your own happiness babe.