B.S.
Not to be harsh but, ARE YOU KIDDING? You have a child with this man! Your child has the right to two happy parents who love each other. You make NO mention of working on the relationship or seeing a prefessional.... I don't get you! ALL relationships take work, sometimes in marriage you are blissfully in love, and others you are just good friends struggling to survive, and other times you hate your spouse but know it will get better again, and you'll get back to the blissfully in love part. Don't give up so quickly!
Children of divorce are 75% more likely to divorce themselves.. not to mention the fact that divorced parents have less time and money for their kids... The statistics for children of divorce are NOT GOOD!
That being said, IF you are truely unhappy, and the problems that the two of you have can not be worked through....then better happy single then miserable together. BUT unless you can honestly say that you could not EVER be happy in the relationship, your child deserves to be given a good start to life (which includes to married parents)