Selfishness
Being unbelievably cruel but not understanding why they had been cruel or that it was a problem.
Leaving me st a party and going home without telling me and saying that I was smiling so I was having a good time so they didn't think it an issue (I'd travelled almost 3 hours to visit them)
No communication
Not interested in me when a new hobby came about
Unable to combine two 'things' eg me and hobby so I was bullied by them when at a hobby meet-up with them, ignored at best, constantly picked at at worst
Showering me with gifts but not allowed to call them except in exceptional circumstances
Sex was robotic and constantly hurt me, eventually left me injured
Fastidious about hygiene, clothing and food to the point it became a real problem
Future faking because ASD tends to have a 'masking' phase and in mine's case, did what people do when they first get with somoene and those conversations arrive, pretended they wanted something they didn't because 'It's what you do'.
Leaving me to cope with a very serious potential diagnosis alone because 'don't understand things like that'..
Anyway, I won't go on. There are support threads on here and Cassandra syndrome groups on fb.
Some NT/ND relationships do work well.
But I'll never, ever enter one again. I am still recovering and I'm a changed woman, and not for the better. My mental health is fragile and shattered and I've been opened up to a world I never wanted to know existed.
But that's my experience. Or more accurately, a small fraction of it.