YOU SAID:
Suspicion that a character, once thought trustworthy, may not be trustworthy!
INTO JAPANESE
一度信頼できると思った人物は、信頼できないかもしれないという疑念!
BACK INTO ENGLISH
Suspect that the person who thought it could be trusted once might not be reliable!
INTO JAPANESE
一度信頼できると思った人が信頼できないかもしれないと疑っている!
BACK INTO ENGLISH
I doubt that one who I believe once trusted may not be reliable!
INTO JAPANESE
私は信じている人が信頼できるとは信じられないかもしれないと私は疑う。
You've done this before, haven't you.