Feeling kinda scared

Hi! Idk if this is the right place to post but I was just thinking about life and what I’m going through right now. I’m 28F. I left my first relationship last year, we were together 3 years but it was toxic and I’m glad I left. I took the break up really hard and it’s been 10 months now and only now am I starting to feel like I am healing. I also found out one of my best friends betrayed me and was being disrespectful with my ex so I had to cut her off too. Now, my best friend of 15 years is hanging out with the friend who betrayed me acting like nothing happened and they’re best friends so I feel like I have to not be friends with her anymore either because I don’t want to be involved with these people anymore. I don’t understand why all of this is happening, like did I do something to deserve everyone betraying me and now I deserve to be all alone? Maybe it’s karma, and in that case I guess it is deserved. I’ve never gone through anything like this and I feel like I’m way too old for this drama which is why instead of fighting I’m just removing myself but it still feels scary and really lonely losing all of my friends, especially a friend I thought I would be friends with forever. I don’t really know how to cope with this I think I’m kind of in shock. Is this experience normal? I just feel weird about life right now.