I wish I could hug you and bring you tissues, glasses of wine and a neverendingly absorbent shoulder! Of COURSE you're still lost and heartbroken. What a hideous, awful, tragic experience you're going through.
I went through ALL THESE FEELINGS when my first husband left. I wanted his family to stay furious with him forever (they didn't), and I felt betrayed by even his own MUM when she still let him go round there for lunch! 
I felt like all my friends were sick of my moaning/crying, and ended up telling complete strangers my life story on a couple of occasions. 
The thing with situations like these is, they never actually "finish". Every day brings a new emotion, new situation, new change... It's not like you can draw a line in the sand and then start getting over it. (Like you could with a death.) "It" moves with you, it's ahead of you, all around you and behind you too. He's still alive, still seeing your children, still everywhere.
Please be gentle on yourself. Counselling will be good even if just yo give you a person on whom you can offload without guilt, because you'll be paying them.
I'm really sorry this is happening to you. There is hope and light waiting for you, but I know you can't possibly see that yet. Now is the time to dry, and rage and wail. Let it ALL out. One day you will cry your last tear over this. It might take 100,000 tears but you will eventually hit the last one. Get started! I used to go up to bed early, stuff a pillow in my mouth and just HOWL. 