It seems to me that you may think you are 'stuck' in this relationship now no matter what and can never change that. Try not to think that way. If you are really thinking you want to get out of it maybe you can't see a way out now, but there may be one in the future. I've been there too. Thought I was stuck and things could never change. Eventually they did. Don't let the things your husband says get to you. Do what is best for you and your son.
Good Luck!