Dual Citizenship (dual passport)

I am US citizen by Naturalization, now I want to go back to my foreign country (they are not recognize dual citizenship). I want to exit from US using my US passport but I am gonna entry to foreign country using my foreign passport. Will the foreign country will know if I was using my US passport when exit from the US ? is the airline report the citizhenship of people who board the plane to their destination ? I am doing this because I want to stay there for longer time, and if I am using US passport will be alot of bureaucracy that I should do, & I don't want that, time & money...please help....

[AFFA]

I wish to inform you that rules of law enforcement agency at the port of entry of other country will determine your entry into your former home country. In this regard, when the other country does not allow dual citizenship then you cannot have two passports. When you enter a country your passport is generally stamped with date of entry. Further, when a person leaves a country then date of departure is mentioned in passport. In this regard, it may come to the knowledge of officials of the other country that you have dual citizenship or use two passports. Duties of the airline to inform about citizenship details of customer depends upon rules of a particular country. Generally, PNR (Passenger Name Record) is being monitored by a country's law enforcement agencies.

AFF