Hayate is forced into a situation his only viable option is to do something illegal, unethical, and unbecoming.  After being called a Mom like figure to Nagi, Maria goes to the source on information regarding Nagi’s father.
I can't believe you'd 
 do this just because
¡No puedo creer que hicieras esto solo
¡No puedo creerme que hayas hecho esto
Nunca pensei que você
 faria uma coisa dessas