I just found out my boyfriend has been sleeping with my younger brothers girl, my younger brother broke up with her in April but she decided to use my own boyfriend of over 4 years as a shoulder to cry on. She bluntly said her reason is to get me pained because she assumed I caused the breakup between her and my brother (I didn’t do that). Before I could confront him 🤦‍♀️ about it he told me to my face he’s dating her and they have been having segx since may. Anyways I have nothing to lose he has always been cheating and I kept on forgiving. I’m just hurt because I’m still grieving over my late mum 🕊🥹 and now this.