The woman with whom Felix is in love in Mary Shelley's gothic classic Frankenstein is Safie, the daughter of a Turkish businessman who first befriends and then deceives Felix's father, the blind old man DeLacey.
Descriptions of the relationship between Felix and Safie are gleaned from the creature's observations of the DeLacey family from his hidden location at the family's cabin in the woods. The affection Felix felt toward Safie is noticed by the creature soon after her arrival at the cabin:
"Felix seemed ravished with delight when he saw her, every trait of sorrow vanished from his face, and it instantly expressed a degree of ecstatic joy, of which I could hardly have believed it capable..."
Suggesting that Safie's feelings toward Felix may have been more subdued, the creature described her reaction to Felix's expressions of love as follows:
"She appeared affected by different feelings; wiping a few tears from her lovely eyes, she held out her hand to Felix, who kissed it rapturously, and called her, as well as I could distinguish, his Sweet Arabian. She did not appear to understand him, but smiled."
Again, in relating to Victor Frankenstein its understanding of the history between Felix and Safie, the creature describes Felix's observations of Safie when the latter visited her father, whom Felix had endeavored to try and help, in prison:
"...Felix...when he saw the lovely Safie, who was allowed to visit her father, and who, by her gestures, expressed her lively gratitude, the youth [Felix] could not help owning to his own mind, that the captive [Safie's father] possessed a treasure which would fully reward his toil and hazard."
Felix was in love with Safie; the degree to which his feelings were mutual is suggested by the following passages depicting her search for Felix and his family:
"By some papers of her father's, which fell into her hands, she heard of the exile of her lover [Felix]..."; and:
"...the woman of the house in which they had lived took care that Safie should arrive in safety at the cottage of her lover."