Good for you for leaving! I'm glad you have the support of friends and family. It is normal that you think of him, he was a big part of your life for a long time. Believe me, it will pass.
He's a grown man, how about he takes care of himself. We take care of ourselves, maybe they can too.
It's okay to feel sorry for him, but don't let that change your choices. He made choices and decisions throughout your marriage that resulted in your leaving; sometimes people just have to live with the consequences of their actions.