Can I sue for emotional abuse and negligence?

You need to talk to your therapist more than a lawyer. If he fathered children with you, then he is obligated to support them. In some states, you may be entitled to "palimony," so you probably should talk to a lawyer in your state. Since you were not married, you do not have the same rights as a spouse, regarding property, etc.

Your bed, you made it, literally you wanted to avoid marriage. You did. Look at the price, forget the idiot and get on with your life.

Let me quote Elspeth Cypher, Associate Justice of the Massachusetts Court of Appeals, "Many wrongs which in themselves are flagrant ingratitude, avarice, broken faith, brutal words, and heartless disregard of the feelings of others are beyond any effective legal remedy...Out of the human condition may arise a myriad of emotional responses including anger, sadness, anxiety, and distress, many of which are attributable to the conduct of others. While perhaps blameworthy, such conduct is often not legally compensable."