how do i divorce my wife? can anybody tell me?
Piss her off so greatly, that she will issue a court order for a divorce. Don't forget to take back the ring as it is essentially yours (Because you bought it). Court process might take a while depending on the time you guys spent together and the things you've bought (House,kids etc). When that's over some of YOUR money will be taken by her and you'll be single again.
But if you're talking about in-game wife, send in a support ticket and you'll be divorced for free.