there's no easy answer. relationships are never black and white
  - always shades of gray and color. Messy. Confusing. people suck
  and people are wonderful. no feng shui for relationships. you'll
  ALWAYS be in some sort of a relationship with him because he's
  the dad. what you have to figure out - and only you can - is
  what KIND of relationship will you have with him? chasing after
  him for child support checks? visitation? take him back knowing
  his flaws (some may be fixable, some may never be fixable)? it's
  no longer "the devil you know vs the devil you don't vs staying
  single?" - the baby changes everything. so you have to figure
  out for yourself, "what kind of relationship do I want?" "