Well...the title says it all really!!
Source:
<http://www.caughtoffside.com/2012/07/20/thiago-silva-apologizes-to-ac-milan-fans-over-psg-move-he-didnt-want/> 

We needed him....

I bet it's all because of the money they offered...

Like Nesta from Lazio to Milan...on force .

it is confirmed