Some loltastic replies:

I'll bet ya two to one that your relationship doesn't work out.
Well, is he winning any money? If he's winning, okay, let him keep it up. If not, it's time to take a hammer to it, I guess.
He sounds like one huge ***. Leave him if only temporarily. Cut his internet. Block the poker sites. Ignore him or even do something constantly that will drive him up the wall.
He deserves whatever he gets.
He just needs some help to calm down. Right now he lives in a very dramatic fantasy world that's very addicting, you just be glad it's not real money he's playing with. Just try to find some help, don't cut anything yet.