Is it normal for my boyfriends aunt to buy him sex pills against my wishes?

My boyfriends aunt keeps calling him offering money rides and overnight stays. She wants him to go to the store, the doctor, the fxxxing senior center, gambling, bingo and cards. She pays him money and drives him for sex pills alcohol and drugs. She’s stayed in motels with him. After sex with me he says he needs a cheeseburger. She calls him during sex with me and asks him to come to her house for cheeseburgers. When he goes to her house he refuses to come back. He stays with her on sex pills overnight. He says he’s been taking them since teenager. His aunt is 77 and he’s 52. She has done this to many potential mates he’s had. She tells him she has money for him. I’m not allowed at her house. She says she waits for him. His aunt has ruined his relationship with his mom by calling her a whore and myself to. His aunt assaulted me telling me not to have sex with him. She refuses to help him financially or with emotional support if he’s with me. She makes him promise her things like a date. Going with her to the doctor or store. WE have our lives and she has put a giant burden on us. She knows he needs money so she offers it but he has to be single. She only gives him money if he says he’s single. She sets him up on dates and she treats him as her husband. He needs money so he has to has to be with her. She offers him whatever she can to get him to be with her. We’ve missed out on years of holidays and vacations because she’s made him obligated to her. Rumor is she’s molested him as a child. He told me his aunt set him up to lose his virginity to HER DAUGHTER. Do I keep him away from her or send him to her? It’s ruining our relationship. She wears thick makeup and waits for him everyday.... I can’t take any more. What should he do? What should I do?