I need some advice plz!!!!?

I am also using the email account of my bf with his permission,the other day while i was using his ym his friend send a message asking why he has two account on Frndster without knowledge dat im the one using his ym on dat tym while my bf is sitting beside meh,i try to check it and ders 1 girl on dat account and while i browse on the profile of the girl i saw dat they have the same school on high school and college,and he's status there is single while it should be in a relationship same like on his other account,he denied it but im totally sure that he's the one who make that account,my Question is why do u think he had to make another account for that girl?is she important to him?

i need advice plzzz.....