my SO was so happy and rubbing my tummy with my son and doing everything but with this one which is…

my SO was so happy and rubbing my tummy with my son and doing everything but with this one which is a girl he don't do anything I have to make him rub my tummy. And I'm doing everything with the two kids we have and then asking him why that is he gets mad and starts a fight he's always down stairs in the carport all day why I'm doing everything I hate this.