You do not know he is doing so great in life, he told you about a promotion and you are mind reading the rest. It is generally accepted that the WAS is in as much pain if not more than us, but who knows right, what gives if everybody is just in pain and there is no happiness for any of us? Yes, it $ucks, all of it, his bachelor life style, his abandonment, the irresponsible immature choices but can you change any of it? You are dealing with a man child.
Either way does it matter, his promotion, his success, his social life, none of them have any relevance to your own. Well promotion and more money could mean more in child support if at all it comes to that. In the meantime, how are you improving your own, how are you taking your life to the next level? What are you going to do differently that there is a remarkable improvement in your quality of life in a month, in 2 months and 6 months down the lane? It could be as simple as enjoying yourself more with your friends, investing more in your kids, exercising more often or even reading a few more books. Whatever makes MamaB the best she can be for herself and for the people who still really love her and cherish her.
Do something for yourself today, ruminating and grieving is inevitable I know, but find some time out of it to just enjoy the life you still have. We are all here for you , hugs.