I 41F broke up with my boyfriend of 12 years 39M because I found out he was sleeping with my sister 34F.ufffd.

I know breakups are painful, but I never imagined I’d be going through one at my age, and so publicly. I, 41F, broke up with my boyfriend of 12 years, 39M, because I found out he was sleeping with my sister, 34F. It feels like my whole world has been turned upside down, and I'm lost for words to explain how I'm feeling.<br><br>We had been together for over a decade. He was my rock, my confidant, my best friend. I thought he loved me, and I loved him. But everything changed when I discovered the truth. My sister, who had always been like a little sister to me, was having an affair with my boyfriend. It was like a punch to the gut, a kick in the chest, a slap in the face all at once. I felt like I was drowning in a sea of betrayal, and I couldn't catch my breath.<br><br>I'm so hurt, so betrayed, so angry, and so confused. How could he do this to me? How could she do this to me? Why would he choose her over me, his long-time partner, the mother of his children? Why would she betray her own sister like that? So many questions swirled in my mind, but no answers.<br><br>I know breakups are never easy, but this feels different. It feels like a loss, a grieving process. I’m struggling to come to terms with the fact that the man I loved, the father of my children, is actually a cheater. I don't know how to move forward, how to heal, how to find my way back to a place of peace and happiness.<br><br>I'm reaching out because I need advice, support, guidance, whatever. I need to know if I'm overreacting, if I should try to work through this, or if I'm better off without him. I need to hear from people who have been in my position, who have had to navigate through the mess of betrayal. I need to hear your stories, your advice, your words of encouragement.<br><br>Thank you for taking the time to read my post. Thank you for taking the time to comment. Your words mean more than you know. I appreciate your support.<br><br>[TLDR] I found out that my 34F sister and my 39M ex-boyfriend were having an affair. I’m heartbroken, confused, and betrayed. I need advice on how to move forward, whether to try to work through this or if it’s better to let go and heal on my own.