It sounds like he's not really too keen on the idea of splitting up himself. After all, you asked him to move out. I can understand why under the circumstances though. You say his attitude is that he is out of the marriage for good, are you absolutely sure? Or, is this just a guess at what's going through his head?
Perhaps something like Retrouvaille would help you two.
On another note, I find it interesting that you posted your situation here at this time. I've seen a commercial playing on TV for a drug and it's the first time I've ever seen a commercial for a drug list behavioral changes as a possible side effect. I can't remember all of the side effects they listed, but I know compulsive gambling was one of them. I'm very leery of any drug that's been around for less than 10 years myself.
