Mr. Bingley inherited property to the amount of nearly an hundred thousand pounds from his father, who had intended to purchase an estate, but did not live to do it. -- Mr. Bingley intended it likewise, and sometimes made choice of his county; but as he was now provided with a good house and the liberty of a manor, it was doubtful to many of those who best knew the easiness of his temper, whether he might not spend the remainder of his days at Netherfield, and leave the next generation to purchase.

请教老师：

but as he was now provided with a good house and the liberty of a manor 这里的provided 是形容词，还是被动语态呢？从没见过这样的句型be provided with.

另外，it was doubtful to many of those who best knew the easiness of his temper, whether he might not spend...whether从句里为什么有一个not在这里，而不是在句尾类似or not这样呢？

it was doubtful + whether he might not - 这样的句型，它的真正含义是什么？