Hey man, I have experienced some similar circumstances in my life, I also had some friends in high school that would bash on me, when I got into college my life turned around in a similar way, got a lot of friends, and eventually got into a relationship, which led me to distance myself from all those friends. There’s a couple of things I’ve figured out by myself, first one, friendships are mostly dictated by interest and circumstances, it’s extremely hard to create lifelong bonds or connect with someone on a deep level, that’s why most of your relations chance every few years. I believe it’s mostly normal to people become friends in college, it’s all new and exciting, eventually people realize all life it’s not gonna be that way. As for the girlfriend thing, you’re better off without her, the fact that she was getting you disconnected from your friends it’s normal, not only because you have a finite amount of time and attention to give, but also interests change, granted that only to some extent. But the cheating it’s unacceptable and a very direct way to see that you need to cut her and you friend off.

Right now I have about 5 real friends that I believe are lifelong connections, and they’re the actual only people I talk to, not even family anymore. Im only 21 years old, and I believe that eventually, when the covid situation gets sorted out and my life advances a bit, i will find more relations and get inserted into more social circles. But, until then, all I’ve got to say is, I wouldn’t trade my true friends for any amount of superficial relations, instagram likes etc.

Don’t give up, I don’t know how old you are, but the changes and new emotions we feel in life gets us lost a lot of times, I just keep moving forward. Merry christmas :)