Cutting off a friend

So I was dating this girl for about a year. Anyways nearing the end of our relationship a week prior to her breaking up with me she was still saying stuff like I love you and anything along those lines. Then abruptly she kind of like got very dry and wouldn’t talk to me as much and then I knew that’s when she stopped liking me. I asked her about and she broke up with me. Then I was pretty depressed for a while and still sort of, but I had heard afterwards she started talking to this guy 2 weeks after our breakup (soon to be friend of mine). I also heard they were talking really bad about me and I didn’t do anything bad or anything rude. So it made me upset that I was getting done so wrong when I didn’t really deserve it, but after a while I chose to make myself forget about it. The girl I had broken up with asked me if we could still be friends and I said yes because I just really naive at the time and heartbroken. She asked me saying she was sorry but I was told by a pretty reliable source she was just trying to play with my feelings. I didn’t believe it, but I said no to her asking me out and chose to stay friends. Anyways that’s when I met this guy and for privacy reasons I’ll give him a fake name of Adam. I really like Adam he’s a good genuine friend. He introduced me to this friend group and in this friend group I met the dude who was talking to her. I didn’t know they were still talking as much time has passed by this point. However I also didn’t know him and her were still talking bad about me. Then they stopped talking and the guy found a girlfriend and I integrated into the friend group. Choosing to forget about my prior relationship with my ex and staying friends I became friends with the guy whom she was talking to. For privacy reasons his fake name will Kyle. Anyways I thought Kyle was a good friend. Until recently whenever I had a deep discussion with Adam who was asking for advice on girls because I’m more experienced than him. Even more time has passed by now for reference. Then he was asking me if I ever got done bad by any girls. I told him that story but I was so naive that my ex was a good person that I still had some doubt and didn’t fully believe it myself. Until he basically confirmed everything and kind of even more. The worse part is this has all happened in a year span from this post. I’m pretty upset and felt the need to reevaluate my friendships. I cut off Kyle, but I also cut off the friends who knew about it and didn’t tell me. The only one who told me a thing was Adam. I’m so upset because this has all happened in fairly recent time that being the year span. I also thought Kyle was a good friend and finding out he was doing all of that whilst knowing me and as we were becoming friends. I also cut off my ex obviously for doing me like that and staying friends with me while being fake and talking behind my back like crazy. Despite this I feel ashamed of cutting off the friends who but didn’t tell me. Did I overreact I feel as if I have and feel even worse, but am willing to make amends.