My H was ENGAGED to marry his OW, the only problem, he never divorced me! He told his OW so many untruths that their relationship was never going to work out. Then, one day sitting in counseling with her to work on their relationship, he decided he wanted to be home. It just goes to show that you have no way of knowing where things will go Hope224.
I would recommend pretending OW doesn't exist. Just get out and enjoy your daughter. Join a moms group, or start your own even when u don't feel like being around others. Understand that even if you were perfect (loving, happy, supportive, doing fun things) he probably won't "see" you while he's distracted by her. If you have patience, and you don't make things worse by living the life if someone consumed by the pain of having an H seeing another woman, he may come back.
First things first, forget about him and do what you need to be happy. If he's not helping with the baby enough - call a sitter (no guilt trips). If he's w/ a skeevy person, keep some physical space. And SMILE because you are going to get through this!
BD: Aug 2012 Separated since May 2013 S born Aug 2013 Aug 2013 H agrees to consider 'baby steps toward working things out' H is/was actively seeing someone?