Work on making yourself happy Twist. Do not contact him at all. You can't make him love you by calling him or IMing him. I am currently in the same boat as you are. I have not talked to my W for nearly 3 weeks at which time she told me that she planned to file this week or next. It sucks but it is what you have to do. He has to be curious about you and want to work on things. Going after him will just push him away right now. Give him time to think about what he is doing and you take care of yourself.
"Seek first his kingdom and his righteousness, and all these things will be given to you as well" Matthew 6:33