I don't think he is reasdy to say he wants to be with her. I Think there is a little voice in the back of his head saying, "If the baby isn't yours, you can go back to Corey, like nothing happened!"
I tend to agree. It's impossible to know what he's really thinking, of course. But, I'm sure his addiction is dictating the way he feels. The Troll feeds his addiction and it's too much for him to give up yet. I think two key things are at play: the addiction, first and foremost, and the "unknown" with the baby. I don't think he loves the Troll, but he loves what she 'allows' him to do: feed the addiction.
Your situation is so difficult. The only suggestion I could make is to focus on yourself, your school work, your children and your future. Always know you'll be OK no matter what happens with your marriage. You are loved and cared for by many. Oh, and TRY not to analyze everything your h says. He's very confused.
((((((((Corey)))))))
M: 37 H: 36 Married: Aug 13, 2004 Decision to Divorce: July 20, 2008 Reconciled: September 2008 Current: Ambivalence