guard your self
I can understand that you feel like your "friend" has betrayed your trust. Because he has. Evidently he allows himself to cohersed into doing something like leading a wolf to your door. Not a very trustworthy friend to have around.
But, like Tbob said, don't give up by giving into these types of people. Just keep up your guard like you have been doing.
We can't afford to loose another responsible gun owner from our ranks.