wildmane

I feel for you, your "husband" and I use that term loosely, is acting like a self absorbed child. I would get out of the relationship at this point. He's neither acting like a husband or a father to your son.
I was in a similar situation with my marriage, it took me almost 5 years to end it. In the end I was relieved beyond belief. It was the best thing I ever did for myself. Think about your son, do you really want him to grow up with this man as a "role model"? A marriage is about a partnership, both parties contribute to the relationship. Each others happiness should be important to the other. Both people give 100% to the marriage. You are currently living with your parents right? Talk with them, are they supportive of you, would they allow you to stay there till you and your son were able to get your own place? If so, then I'd be saying "see ya" now. You deserve someone who enhances your happiness, not drags you down. Sex is an important part of a relationship, any well rounded adult knows this.
I wish you the best....leaving this man won't be a piece of cake, you will grieve the loss of the marriage and that is ok, it will help you to move on. There is better out there, and even if there wasn't I'd rather live by myself with my son than with someone who is so selfish and only concerned about himself. Good luck