I, too, kept my boyfriend a secret for a long time. I was already out on my own, which made this easier. In fact we had been living together for over a year before I told mom about him.
I don't have any advice about what to say to your family. I know none of them would ever have listened to any "apostate" info and would have quickly shut me out permenatly. They don't like my current wordly way of life, but I was never Df'd so they still talk to me. I figure the best "witness" I can give them about the WTS is to be happy and sucessful away from that religion.. which they think is impossible, of course. I should be miserable now that I am in the world:)
I can tell you that not pretending any more feels great. Keeping my boyfreind a secret was a terrible strain on me, and once they knew about him they knew I wasn't an active JW anymore. It was such a relief!
Misty