I’m so disappointed in my brother

My younger brother is gay and I love him to death. But I’m just so scared for him. He makes the dumbest decisions ever. He always calls me to vent and for advice but never takes it. Anyways he moved out of state and has been very promiscuous. Like sleeping with every he meets. I know these things because he tells me. Usually I’ll just tell him to be safe and that’s that. He confided in me telling me he doesn’t like to use condoms and the guys he sees are DownLow, he knows he’s dead wrong because he’s too afraid to go to the doctor. Smh. Anyways, he told me he slept with a dude that was HIV positive, but it’s undetectable because he takes his medication.(He saw no paperwork or went to the doctor with this dude). . Told me he felt sorry for the dude because he gave him a sob story about how no one wants to mess with him because he’s HIV Positive. Smmfh. Although my brother is grown and it’s his life.. I’m so hurt and scared for him. Idk how I can get him to realize his life is worth so much more😥😥