My very existence is a disappointment to my parents.
I was top of the year in most subjects, played 3 musical instruments, was in the all school productions, choirs, bands, orchestras, (including running some of the younger ones), never lied about where I was going (really!), never got drunk (until I was 18), never took drugs (at all), didn't have sex till I was 19, got a first class degree (as a mature student).
My parents split up and my mum blamed me for that. There were quite a few arguments as I was a teenager but largely because I felt I could do no more (see above) and they were never satisfied.
Now I'm older I've realised that my mum is a bit strange. In reality, she likes being a victim. I was such a good kid (on the whole, I wasn't perfect!) that she didn't have anything to complain about. And she despised me for that.
My husband mentioned the blaming me for the divorce bit to her a couple of years ago and she confirmed that she still holds me responsible.