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I saw plainly that he was surprised, but he never attempted to draw my secret from me; and although I loved him with a mixture of affection and reverence that knew no bounds, yet I could never persuade myself to confide in him that event which was so often present to my recollection, but which I feared the detail to another would only impress more deeply. (6.12)
Victor feels disconnected from Henry because he is keeping his knowledge as well as his monster a secret.
My father had often, during my imprisonment, heard me make the same assertion; when I thus accused myself, he sometimes seemed to desire an explanation, and at others he appeared to consider it as the offspring of delirium, and that, during my illness, some idea of this kind had presented itself to my imagination, the remembrance of which I preserved in my convalescence.
The secrecy of Victor’s discovery makes him appear crazy to those around him.
I avoided explanation and maintained a continual silence concerning the wretch I had created. I had a persuasion that I should be supposed mad, and this in itself would forever have chained my tongue. But, besides, I could not bring myself to disclose a secret which would fill my hearer with consternation and make fear and unnatural horror the inmates of his breast. I checked, therefore, my impatient thirst for sympathy and was silent when I would have given the world to have confided the fatal secret. Yet, still, words like those I have recorded would burst uncontrollably from me. I could offer no explanation of them, but their truth in part relieved the burden of my mysterious woe. (22.4-5)
Victor feels that his creation is a secret burden that cannot be relieved.