i'm sorry that you are hurting, time for you to take the focus off him, he's gonna do what he's gonna do and there is nothing that you can do or say to stop him. maybe you can find something that you like to do, a project or something that will keep your mind occupied so that you can stop the obsessive thoughts.
when it got to where i couldn't take the not knowing and i couldn't find a way to stop the obsessive thoughts, it was time for me to seperate myself physically. my own thoughts whether true or false, were making me crazy. there is nothing you can do outside of take care of you. all the unanswered phone calls are only hurting you more, so try not to call if you can.
what helped me is for me to write it down, write all the things that you want to say to him if he had answered. have you gone to any meetings yet? try to detach some emotionally, it helps