How is Veronica's relationship with Duncan described in the novel, Veronica?

Duncan, Veronica's bisexual boyfriend, was mentally and emotionally cruel to her. Sadly, she would always return to him, saying she loved him. When Duncan contracted the HIV virus, he continued to have sex with Veronica knowing the risky position in which he was placing her. Duncan died from AIDS. Veronica forgave him even though she, too, would later die from the disease.