Ug, I can feel your frustration with the situation. It must be harder to have a mate whom also has mental health problems. Regardless of whether you work or not he really should help with your son. Apparently he doesn't realize how hard it is to deal with a baby all day. Maybe you could find something that will take you out of the house for a good bit one day and let him take the full force of caring for the baby. This may make him realize its not like you're sitting around eating bon-bons all day.

I hope things get better for you.