Like any loss, you will go through the stages of grieving...the sooner you can focus on anger, I think, the better. Try to remind yourself of all the bad parts when you find yourself feeling love for him or remembering good things or feeling empty...cry when you need to...and remember you can keep talking here as much as often as you need! I am looking forward to you posting about the 'manipulative man' conclusions you drew from the book...might help me too!
Seriously, know it doesn't help much now but does get better with time; I do well for a while then backslide, plus my life is soooo empty overall, and the loss followed a series of painful events, it became all consuming...don't let it do that to you! Keep occupied as much as possible. So what if your poetry and art is dark right now? If its a relief, a catharsis and helps you get out what you are feeling, go for it! Spend time with friends around an activity like going to the movies where you won't be thinking so much of him or bowling or something where you are occupied and talking is not the mainstay of the interaction. I was fortunate at first after my break-up a friend spent a lot of time with me, the downside was he wanted a romance and I couldn't handle it, so now he's no longer in my life

. But maybe you should get back out there if you can...meet other men....join a dating site...have a friend set you up...as soon as you can manage it. Spend time with your kids and do special things with your kids, arts and crafts projects? go to a museum? story time at the library? I dunno, whatever works for you and the age your kids are.
Vent here, yell and scream and cry in your pillow, I know it doesn't help now, BUT IT WILL GET BETTER WITH TIME...just comfort yourself as best as you can when you are hurting and thinking of him, especially as it may make you weak and want to contact him.
I know that empty feeling. I know what it is to love someone even though they are a jerk and treated you lousy. I know what it is to hurt because someone you love loves someone else and is with someone else. We deserve better. As you posted on another thread, love is a gift and next time we give it, we must make sure it is to someone worthy, someone who will return it in kind.
Sending you big hugs ((((((((((((((mamasam))))))))))) and wishing you comfort and the start of healing....love on yourself a little, do nice things for yourself!