If he told you he was at peace keeping mission in Nigeria "he"is not "he" but "them". A gang of young Nigerian criminals in age 14 - 35 which will never step a foot aside of the internet cafe. There is NO way any of them would ever get American visa and travel abroad. Furthermore you are not their exclusive victim, they scam hundreds people like you daily and they don't have time to play but they love to blackmail their victims. It is one more chance to receive money.
What you need to do now is to BLOCK and IGNORE scammers, do not emails, do not read texts. Just forget them. As soon as you'll shut down your computer the "online world" is gone.
Kindly post: fake profile, email address, phone numbers, stolen pictures, letters, money requests, fake documents.
Please NEVER confront the scammers, they know what they are and it's safer for you to be online.
Confronting the scammer is WRONG!!! DON'T enlighten criminals with your wisdom. REPORT & BLOCK.
PHOTO VICTIM - "Do not confront the owner of the pictures, as they are victims themselves! You will only serve to further the terror and harm !" Silence Is Golden!!! I speak Polish.