@EVILTRAFFICCONE He saved her life from that seal before he planned to kill himself. He saved her out of pure altruism. He sought no reward or blessing. He just did the right thing to do the right thing. He is, as Diogenes would hope to find, an honest man. She recognizes how rare that is, how good his heart truly is, and sought to save him from ending his life. From that, a romance developed.
He saved her, then she helped him find the strength to save himself from those suicidal desires. Simple as that.