Aw, sweetie, I'm so sorry this is happening to you. (((hugs))) I know it's scary, but you're going to get through it and be better off in the end.
Now, listen carefully... any blivet brain, sack of **** who says he can't stand your son has no business in your life. That is one of the cruelest things I ever heard someone say and he's not good enough for you or your son. When you get over the hurt of breaking up, you're going to be much better off without him. There really are good men out there and your Prince Charming will be waiting. You'll find him, just don't settle for anything less.