Found out I was being cheated on the whole time!!! 😩

Hello! I was never married or anything but I Found out my boyfriend was cheating on me the whole time we were dating! I found this out last night and I am so upset about it. He always told me he would never cheat on me and here it goes! My own brother was his friend ,he told my brother that he would never cheat on me or mess with my heart and here it goes! He did my brother and my ex bf told me that he has a whole other girl on the side! I wonder if she knows she's been cheating on too , he has never spoke of said anything about the girl! I would of liked If he would of told me him self instead of my own brother and my ex having to tell me. All his friends knew too but never said anything! I looked stupid this whole time , I even feel stupid. Also he would never post any pictures of me on social media or anything! If I posted something on his snapchat , he would quickly delete it and when I would ask him why he deleted it ? He would say oh I didn't delete it , that was my friend or my friend had my phone and deleted it.