仮定法過去のhadとwould

仮定法過去で、If I were you,に続くのは、I had not tell him the truth. He might be angry about it.が正しいでしょうか。I would not tell him the truth. He might be angry about itが正しいでしょうか. 文法的にはどちらも合っているでしょうか。