Husband now wants to be a Polygamist?!

So to sum this up as shortly as I possibly can. Husband and I have been married almost 2 years. We both want a large family, are both Christian. We starting trying to have a family right away, had 2 early miscarriages. Both were tested, all is good. Well, now he decides about 8 months ago that because he wants to have as many children as possible, he wishes he were a polygamist instead. I asked him why, explaining that we could have a large family through natural and adoption like we always planned and he said it wasn't enough because he'd always know he could've had more. So we work together, running an apartment complex and live on the grounds. I moved into a separate apartment about 3 months ago because he wouldn't get off the polygamy dating sites and talking to other women. He doesn't think we can get divorced, nor does he want to because he believes that would be adultery according to the Bible, but yet he doesn't think looking for additional wives is, because they would be "his wives". WTF!!! :mad:
So lately things have been a bit nicer, but I'm lost on what to do. I love him dearly and want us to work out, but he hasn't been the same since all of this started. He no longer hugged, kissed or said I love you, no sex, nothing. He knows I know he's talking to women, and he says things like "I just didn't think it through before getting married", "What am I suppose to do, not get what I want."
I feel like my husband dies and this new man has taken his place. I am very much thinking of giving him an in depth Bible study I've created which I believe shows God's ideal as one man and one woman and also in the letter it's saying that I will not continue being with him if he will not give up this lifestyle idea. Any advice on what to say to him or do?

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