There are two tactics at work when you find some fun for yourself. I don't like to call it get a life because I find that insulting. I call it finding fun. It better expresses the goal in mind.
Anyways, if you put 100% into you, then it gives him a LOT to think about :
1. Why would I leave this adventurous woman? 2. Why don't I want to be around this sexy woman? 3. Why can't I just calm myself down and enjoy myself with her? 4. Why am I being such a hard-ass when she's being so great? 5. Why am I so scared of something this great? 6. What am I waiting for? 7. Why am I making such a mess of things when she is doing so much that makes things fun and inviting?
Believe me, some of this CAN be triggered in his mind, but you need to
a. STOP your bad habits - pursuit (read up on the stop the pursuit passage in divorce remedy - you arne't following it) b. START some good habits - find some fun and bring that fun into your home and your life
If you do a AND b, it forces his conscience out in the open and lets his conscience to the work for you, it forces those questions on him. But until you do a and b, he will never hear those questions.
If you want him questioning what he's doing then you need to do a and b above.
Also, if you can think of anything specifically that he complained about before he wanted a divorce that would help zero in on what was/still is motivating him to leave.
Conscience can't do its work if you keep harassing him with the phone. I would just stop calling and leave him to call you.
And YOu should end the call FIRST, tell him you are busy and have to go. My guess is you call him most of the time and he ends the call most of the time as well. Do the 180 and reverse that because what you are doing is just smothering him.