My brother has been dragged back into the relationship and I am livid.

I'm writing this from a throwaway account because I'm not about to spill my family's dirty linen on my main.<br><br>So here's a quick rundown of what happened.<br><br>My brother is in his mid 30's and he was dating some woman. I didn't know much about her but I knew of her. I never liked her much, she seemed very self-absorbed.<br><br>They were dating for 3 years. He lived in his own place and so did she. They would go on holidays together and she would spend some nights over at his place occasionally.<br><br>Anyway, long story short he proposed about 6 months ago and she said no, she didn't want to get married. I think he just accepted it and they continued on like before.<br><br>Then about 3 months ago he found out she was having a full-on affair with her boss. I think she would've rather he didn't find out but she needed money and my brother is fairly well off so she would regularly ask him for money. She would spin elaborate lies about why she needed the money eg: landlord jacked up the rent, car broke down needed new brakes, needed new glasses etc etc. So my brother decided to surprise her one day and pick her up from work. She was in the car with her boss, he had his head between her legs.<br><br>He called me straight away in tears, I was furious, I wanted him to leave the area and go somewhere and cool off before he did anything rash. He thought she would come crawling back when she found out how much money she was going to lose.<br><br>She called him dozens of times, she begged him to forgive her, he did. I was so fucking annoyed. I told him she was going to cheat again and he was just being a fucking idiot. <br><br>Anyway, some of her friends and family were passing around photos of her blowing her boss in a pub. He decided he'd had enough and dumped her.<br><br>It's been 3 months now since the break up, she's been begging him to take her back. She even said she was going to kill herself, fucking karen.<br><br>So last night out of the blue my parents call me saying that she's back together with my brother. He let her move in and he bought her a new Audi TT.<br><br>I was fucking livid, I'm still fuming as I write this. I told my parents how I felt and they said that it was none of my business and that they were happy he was happy.<br><br>I plan on having it out with him later today. I am so fucking angry I could spit blood.<br><br>&#x200B;<br><br>Edit: I just texted him and he confirmed they're back together. I'm going round there later todays. If he's happy with being a cuck then there's not much I can do, he's made his choice.<br><br>Edit 2: I just spoke to my sister and she said it was my mother who set the whole thing up. She wants grandkids badly and thinks that if he's married he'll be more stable.<br><br>This makes me especially angry since my mother knows full well that he has a low count and the prospect of him having kids is slim.<br><br>I'm actually going to go to the extreme here and call up my local priest and see if I can meet up with him today, I don't really believe in God, but I believe in the message of Christianity more than the modern message of societal morality and the priest is an old family friend who I trust will give me the best advice.