Not everyone is what they say they are online. He could be a 64 year old bald man from Grimsby.
Our local paper featured a girl who thought she had been chatting to a guy for ages and found it was 3 of her female friends who had been fooling her all along.
As Cheekychops says, take a friend or friends along with you.
DONT meet him alone, DONT meet somewhere private.
Meet in a VERY public place.
If you are young tell your parents what you are doing before agreeing to go.
Dont tell him your address or phone number.
Sorry to be so alarmist but there are some VERY scary people out there.