So my mate and his fiancee broke up and as far as I'm aware he did all the dumping. Everything remained civilized until he went out one day and she went into his flat and took the engagement ring he gave her.

He noticed it was gone and has asked for it back, and she's apparently gone full-scale psycho with varying threats against him if he doesn't let her keep it.

Let's discuss who is right and who is wrong... (also, I hope he doesn't read this forum)