I am sorry Chaim for the trouble you have had with a member, but it pretty well goes to prove, not everything is as it seems. Betrayal is never nice, when it comes from a person that you have put trust in.
People carry different agendas for different reasons, only time will tell who is on the correct path.
I know that person was not the first, nor will be the last, but you do good work for our brothers and sisters, I wish you well, and I hope you can quickly move on from this.
G-ds choosen path is never easy, for if it was, then we would have achievements that mean very little.
May G-d bless and protect you.