My mom defended my sister cheating and getting married so i told her to unalive herself (FULL STORY)

my mom defended my sister cheating with my boyfriend and getting married so I told her to un alive herself I have recently found out my boyfriend of four years has been cheating on me with my younger sister for the past 6 months he accidentally sent a text meant for my sister to me it didn't have her name but it sounded so strange with how we usually talk to each other I grew suspicious and made the decision to go through his phone during the middle of night while he was asleep there I found months of texts

exchanged between them flirting texting planning dates and making fun of me I was Furious too pissed to go to sleep and ended up confronting my boyfriend the moment he was awake enough to understand what I was saying he admitted to cheating on me with my sister not that I needed him to and that it wasn't his fault and he didn't mean a word of what he said about me in the texts they apparently hooked up during the time back in June because I was recovering from heart valve surgery and couldn't do it with him so

he apparently told this to my sister and she offered him to do it I told him pack your bags and get out of here he just nodded started packing and then called his mom so he could stay at her place I calmed down Enough by the time he left laid down for a nap and confronting my sister over text once I ate I told her that I didn't care what her excuses were she was a horrible sister who did it with my boyfriend at the first opportunity she got and that she'd never see me again

if I could help it once she saw it she sent me a lot of texts similar to my boyfriend's earlier confirming what he said about how the cheating started and just making herself look worse so I blocked her I eventually explained what happened to my dad my mom and my other sister my dad and the other sister were horrified to hear what Ally had did to me and said they would talk with with her my mom however confessed to admitting knowing the affair was happening and letting it happen without telling me she said your boyfriend

treated your sister so well and that my sister was in love with him and deserved to be after what happened with her ex to be clear my sister's ex was her College boyfriend and the relationship she destroyed herself by trying to push him into an open relationship because she found one of their classmates hot I was so shocked by this that I didn't end up even speaking to my mom for a couple of days until she called me and begged for me to forgive Ally and made more excuses for my sister Behavior this happened after

I just sent the rest of Robbie's stuff to his mom so it infuriated even more than it typically would out of pure rage I told my mom that I shouldn't have stopped her from killing herself two years ago since she so invested in defending my sister when I was the one who got betrayed there was just silence on the other end for a few seconds and then my mom hung up my mom tried to kill herself two years ago through cutting her wrists when she and my dad were majorly considering divorcing with my dad flat

out living in a different city than her I had walked in on her right when she was about to do it and managed to get the knife out of her hands my mom then spent some time in a mental health facility and attending therapy which I ended up paying half for it until she gained more financial stability I stayed days at a time to comfort her and make sure she didn't hurt herself when she was feeling depressed now my dad and sister have told me that even though what my mom did was horrible I shouldn't

have said that of all things to her it felt good to say in the moment but now I feel so bad about it I just want someone else's opinion on this