worried about 16 year old son

Hi, I finally did it....after 16 years of wanting out of a miserable marraige.....but although my 16 and 6 year old children could tell this was not a match made in heaven....they are both upset in their own ways. My 6 year old daughter will adjust easier than my 16 year old son. My 16 year old describes his feelings as numb. He does not want to go to counselling. He says he is glad his dad is out of the house and wishes he would just get out of his life......but I don't think he means it. He says now that he just doesn't care about anything and it shows..........he's not even in school today....earache and sick stomache??? I keep trying to get him to talk to me, but he doesn't say much and I am scared of pressuring him too much. His father tried to drag my name through the mud with a crazy story that he dated 18 years ago and that was the icing on the cake for me.........I just kicked him out then and there, right after my son told me of the story. Now my son thinks he's to blame. I have explained to him for a few years that I wanted a divorce and that it was inevidable. HE knows that we only married because I got pregnant with him and wanted him to be raised with both parents. I thought it was the right thing to do at the time. He knows that his father and I have discussed it ALOT, but his father just wouldn't participate in the planning of it....so now it is done without a plan. I am relieved for myself that it is finally done......but I am so sorry for our son. Any advise????m going nuts here.