this person has been stalking me and my friend he sent a pic of my friend from a year ago that she's never sent to anyone and now he's contacting me telling me that he'll be watching. please help; I think it's someone close to us because no one but close friends have my number. He recently disconnected the number but one of my friends said its a text free number

Nobody could help you here. We are not qualified.
You should go to Police ask advise.
They are taking stalking seriously.
Be careful and safe.