Erin,
I just logged onto this website to message today..Reading your story has been almost like I was reading my own. I don't know what to tell you to do. I left my husband and month and a half ago and regret it every single day. Maybe he is having an emotional affair. Have you asked him what is missing in the marriage. You have a young child, do you set a night for just the two of you, your husband and yourself, to spend time together. Go for dinner, a movie, or just for coffee and talk. those are just ideas that I have, cause that is what I wished I would have done.
Good Luck
Lisa