How is he supposed to do so? If they were indeed married and went through a divorce there is likely a court order forcing him to pay for her lifestyle.
Yep. In California or New York, it's typically a year of alimony for each 2 years of marriage. At 10 years, it's lifetime. So he definitely dodged a bullet.
But for a few years, he's probably on the hook for half his income since she was stay-at-home with no career.
There's still going to be child support for sure but after the kid starts going to school she will be expected to get a job, if able, and if she remarries then generally you won't have to pay alimony anymore.
But for a few years, he's probably on the hook for half his income since she was stay-at-home with no career.