There is no reason you can't keep in contact with your friends and family but not tell them where you are initially. One thing you can do is setup a webmail account (I recommend gmail because I like the filtering) and give your family and friends that email address. Even if he gets your email address, you can just fileter his messages into a folder for safekeeping and ignore them. (You can have some else read them for you and tell you if there is anything in any of them that you should report to the police or something.)
Tell your family that you don't want them to know where you are right now because you think it is safer for them if they can honestly tell him they have no idea where you are.
Best of luck!