"She will only be too glad to jump into your arms," said Lady Milborough.

Trevelyan thought that if he went to Nuncombe Putney, his wife might perhaps jump into his arms; but what would come after that?
How would he stand then in reference to his authority?
Would she own that she had been wrong?
Would she promise to behave better in future?
He did not believe that she was yet sufficiently broken in spirit to make any such promise.

And he told himself again and again that it would be absurd in him to allow her to return to him without such subjection, after all that he had gone through in defence of his marital rights.

If he were to write to her a long letter, argumentative, affectionate, exhaustive, it might be better.

He was inclined to believe of himself that he was good at writing long, affectionate, argumentative, and exhaustive letters.
But he would not do even this as yet.