Let's go where the rich nice guys are...first, find out where that is and THEN we need to go.
Haha - I like the way you think! I guess I used to think of it the other way around - that I might be especially attractive to some sexy Spaniard looking for a green card and escape from the economic doldrums in Spain. But I like your idea of a rich guy better!
As for the taxes - your ex probably just realized how much more he's going to have to pay in taxes. You could always ask him to send you his information so you can run the numbers ( it'll give you a chance to see just how much he's been lying about his income!) then tell him you've decided not to file together. Or if there actually WILL be a good refund it might be worth doing (although it's equally possible that he didn't pay all the estimated taxes he should have and you filing with him would just allow him to break even rather than owe money).