How does Frankenstein react to Walton's dream or goal?

'I was disturbed by the wildest dreams, I thought I saw Elizabeth, in the bloom of health, walking in the streets of Ingolstadt. Delighted and surprised I embraced her; but as I imprinted the first kiss on her lips they became livid with the hue of death; her features appeared to change, and I thought that I held the corpse of my dead mother in my arms; a shroud enveloped her form, and I saw the grave-worms crawling in the folds of the flannel.'

Basically, he sees his future bride, and she turns into his dead mother.