This was my reaction as well. My default behavior for years has been to assume everything as my fault. The big turn for me occurred a few months after my ex cheated and I ended the relationship. I kept thinking, "What did I do that made her want to cheat?" But that's a very misguided question. Her behavior was completely outside my control. Eventually I was able to simply accept that it wasn't my fault, and it significantly improved my emotional health.

I get that OP isn't being completely literal or universal. But there is a whole class of neurotic self-blamers out there that could stand to learn the opposite lesson: some things are not your fault.