Unfortunately, or fortunately depending on the situation, that's not how it works in Oz. There's no distinction between cheater and "cheatee" here in a divorce.
And I find it hard to believe he really lost half of everything he got. If he did, he must've not done his research and really got suckered.
As goldfishman said, no fault divorce. Brought in by Lionel Murphy during the Whitlam years.
Unfortunately ghalib the word of 2 woman against 1 man regarding domestic abuse will always win in the end.
My level of sarcasm depends on your level of stupidity.