"necessary to him" is correct and usable in written English.
It is commonly used to describe something that is required or essential for a particular person. For example: "The medication was necessary to him for managing his chronic pain." This means that the medication was essential for this person to effectively manage their chronic pain. Another example: "A good education is necessary to him in order to succeed in his career." This means that having a good education is essential for this person to achieve success in their chosen career.
(Whereas Feathers thinks, with relief, that Betty "was not necessary to him any more").
Dawes has written of such climbs as having been a "form of self-expression… dangerous but necessary" to him.
Yes; and if I remember rightly, when the lives were compared, no degree of pleasure, whether great or small, was thought to be necessary to him who chose the life of thought and wisdom.
His later fiction was compulsive but not compelling, necessary to him but not to his readers, who would always chase the fire of his first novel in the embers of its successors.
Chosen, loved by the one you love — what would be more meaningful than being necessary to him in a practical sense as well, able to support his vocation, his achievements yours by proxy?
Its deeply Scottish Presbyterian fulminations against materialistic desires for "trinkets of frivolous utility", and lofty observation that man has some principles "which interest him in the fortune of others, and render their happiness necessary to him, though he derives nothing from it", can be made to sound almost socialist.
"A Russian publication and a Nobel Prize were necessary to save him". That is an interpretation that Pasternak's son contests.
He was of a shy and retiring disposition; it was necessary to encourage him, to congratulate him, to forestall the possible advances of rival publishers.
They have pleaded not guilty, insisting that Carrillo was uncuffed, fought with deputies and that the force used on him was necessary to subdue him.
Hit him if necessary to keep him down.
He was removed immediately afterward, after throwing 32 pitches, and Girardi felt it necessary to tell him why he pulled him in the middle of an inning.
