That's not true. A Witness cannot be disfellowshipped for dating outside of his religion. The worst that will happen is he will get a stern warning from one or more of the congregation elders; certainly an awkward situation to begin with, and this will lead to gossip around the Kingdom Hall. I know because I did date a girl who was not a Witness when I supposedly was one in good standing.
As a man, I'm inclined to agree that if he's known you for ten years, he most probably cares for you. When I was dating the non-JW, our families were constantly on us to pick a religion. I always thought, can't we just believe what we want to believe? Why do we have to change? As an atheist now, I can tell you it's a damn shame when so much nonsense comes between two people. Whether you believe in him or not, the love of God never kept anyone warm at night.