Behind the JW facade, I think many have worldly friends. Why? Because when they go to meetings (at the kingdom hall to listen to talks) or out door to door - the usual chit chat is just about surface things. How many hours do you need to get this month, experiences about householders, things they bought, what they will do later.... Then after, they go their separate ways until the next meeting etc. Not many have friendships that go beyond that. They have deeper relationships with co-workers.
Your friend is also living vicariously through you. He could never get to do the things that you do as a JW. So it's exciting and very taboo the things you do.
From my own experience, people who are raised as a JW (most anyway) will have as a default, a knee jerk reaction to defend their religion. Even if they haven't gone to meetings for years or actively practice it, if you touch on a subject like shunning or not obeying the elders or the Governing Body (the leaders) suddenly they will become the most staunch supporters.
Right now, the Jehovah's Witnesses organization is being looked at in Australia, England and USA for their handling of Child sexual abuse matters. They have a rule that they quote scripture on, that there must be 2 witnesses in all matters, in order to determine whether a person is guilty. So child molesters, unless they confess, are not considered guilty by the testimony of one victim. Neither is this reported to the police. In Australia, the Royal Commission (ARC) found from the JW own files, 1,006 cases of provable molestation that was never reported to the police. There were many more cases not acted on by the Elders, nor reported to the police because there wasn't a second witness. These cases are also being investigated now by Australia.
The organization has hid this for years. Hopefully, this will all come out soon. Until then, most JW's will not hear or believe anything like this could be true. Just like the Catholics wouldn't believe that their church would shuffle around pedophile priests.
So be his friend, but don't expect him to suddenly think objectively about his religion. And if the time comes, you might be able to help him see that if something this bad is happening in his religion, maybe it isn't so truthful after all.