AITA for telling my mom to shut the fuck up

My fiancè committed suicide back in March. He was stationed in Japan and hung himself. I've been dealing with my emotions. He was cremated. I got some ashes. Recently the letter finally got to me that he had sent. He sent me his suicide letter in the mail so he would be long gone before I got it. In the letter he stated something traumatic happened in Japan and he couldn't live anymore. My mom has recently been trying to figure out what could have happened. She was wondering if he was sexually assaulted. I told her idk. Possibly. I'm not sure. The letter wasn't specific on what happened. My mom is a big conspiracy theorist. She started turning my fiance's suicide into some conspiracy and I got pissed and told her to shut the fuck up. I feel kind of bad now but I'm sick of her playing detective then trying to turn his death into some Qanon conspiracy

@Chikky yeah and most mothers hopefully wouldn't try to turn their daughters dead fiancè into a damn conspiracy. I already asked her to stop. My fiancè died less than a month ago. I will probably never know what drove him to end his life. The last thing I ever heard from him was this weird text. When he didn't answer my phone call in my heart I knew. Saying "You should have excused yourself. I would never speak to my mom that way." Did you have your fiancè fucking kill himself in Japan and your mom tried to turn his death into a conspiracy theory after you asked her to stop? After you just received the fucking suicide note? No? You don't know what you would have done. Don't tell me what the fuck I should have done because you don't know what you would have done in my situation. You weren't in my situation. I just got the fucking suicide note and my mom was turning it into a spectacle. If she didn't want me to tell her to STFU then maybe be a real mom and don't put your grieving daughter through fucking bullshit by turning her dead fiance's Death into some conspiracy. She was also in MY house. The home me and my fiancè were starting our lives. So no I'm not going to excuse myself in my house. I told her to stop and she kept on. So yeah she got told to STFU. People always wanna tell people don't talk to your parents that way. How about don't talk to your kids that way? Plush she's never been a fucking mom. I was in foster care my whole life. So in reality I just told some lady that wasn't apart of my life to STFU.