I have a very weird quetion i guess, Who is Marcuses Wife?

Didyme was the wife of Marcus. She was a member of the Volturi until she was killed Von her brother Aro. Aro killed her because her and Marcus were so happy together they decided to leave the Volturi and Aro would not allow it. This death greatly upset Marcus and caused him to become an apathetic being. Didyme was gifted with the ability of making people happy.

i dont remember that in the books.

yes he did have a wife and i think that was her name .if im not mistaken i think aro had killed her.i m not sure why.maybe he was jeleaous . kno one is sure.and no that info wasnt in the bk. i had goten it from my step aunt and it was also found on the authors site i think and on other sites.thats one reason i cant wait for the guide to come out . so i can gather the correct information.