What rationale does the narrator give for staying in the house despite repeated horrors?

The narrator explains his decision to stay in the house despite the horrors by stating that he would not be able to 'obtain the solitude, and the sense of her presence, that alone make my old life bearable' elsewhere ^[1].

He emphasizes that if he 'had not stayed, then I had not seen again the face of her I loved' ^[1]. His beloved also admitted that she 'could not have come to me, had I been elsewhere' ^[1]. After a vision of the 'wondrous Sea of Sleep' where they met, he affirms, 'I know that I shall stay on here, whatever happens' ^[1].