Can someone recap why Henry Cavill was forced out of the show?

Hi, I'm new to the fandom. I bought the game about this time last year, took a while to get into it, played 800+ hours of it in like six months, devoured the book series in a matter of weeks, but put off watching the show because Henry Cavill felt so wrong for the part, I couldn't watch it at first.

I started the show last week and I've ended up liking his interpretation of the character, and now I'm bummed that they're bringing in a reject Hemsworth brother to fill Cavill's shoes. Why did this happen? What is the justification for this? Did Cavill quit, was it a contractual dispute/renewal thing, was there some sort of scandal? I missed all this drama and I don't really trust official narratives that I might find via Google. I figure the fans are my best source for what really happened.

Thanks!