Sorry that you are here. Its understandable for your H to be upset and hurt by your past actions, it is not understandable that he uses you as an emotional punching bag. No matter what, that is just not ok. I agree with Allen in that you need to discontinue contact with you H now. Its time to go dark and get yourself together. Its not a good model for your S to see his dad treat you that way.
Not sure what state you are in, but when a LS becomes a D, the whole thing can be changed. You do have the opportunity at that time to keep the same agreement or junk it and do a new one, so all is not lost.
Take care of yourself.
M:39 H:39 K:S14;D8 T:22yr M:15yrs S:12/28/07 EA/PA 3/14/08 OW preg 11/17/08 born 12/12/08 his ~~~~~~~ Never allow someone to be your priority while allowing yourself to be their option