Can you give me more details? How did you find out about this person? Via email? Have you ever met them?
I'll be frank: This is a scam. Do NOT send any money, for any reason. Do NOT contact this person ever again. If they are "promising" you money, there is NO money.
Many people fall for these scams, but please get out now, so you don't lose any/more money.
Think about it -- why would a random person contact you by email, and then start asking for money?
Now for more details... and links you should read.
Please, please do NOT send money, and do NOT contact this person again. If not, you'll just keep sending them money, and you will not get anything in return -- ever.
Thanks, XXXXX XXXXX let me know if you have questions,