I pretended to be someone else on Facebook.. Help me!?

[Cassey Rojas]

Not to long ago i made a fake profile
then My boyfriends cousin added the fake profile. And started talking to "me" and well for some reason i messed around with him.. i told him all this cute things. i had a number in that fake profile and he called me. and when i answered he got surprised. He said that he recognized my voice and that i sounded exactly as his cousins girlfriend (ME). i laughed and hanged up. the next day he sent me a messaged and said if it was *Me that was messing around with him. i got nervous and said no but i know he knows it is me and i have a feeling he will tell my boyfriend. what should i do??