Runforthehill, darling, don't feel bad about this, give grateful thanks that you found out before you were married to this prize idiot.
Thing is, even if he was only kidding, it's too late now and if you stuck with him you would always wonder about his motives.
NOW, battle plan, get him out and get your job stuff sorted, great you are ready and able to do this.
TWO: never, ever forget your worth, as a person, and in terms of assets, and your darling DS.
Vet everyone very carefully. Think Is this bloke worth half my house? what has HE got to offer ME? if the answer is nothing, then tbh, you need to keep him at arms length. I know it's awful, but when you have seen the depths to what people will sink to, to get hold of a free house, nationality etc, that I have seen, you learn to think differently.
Plan for the worst, hope for the best.
Well done for finding the strength to do what's right