Scammed by exchanging Referrals.

I joined a forum for the members to exchange the PTC referrals. At the beginning, I were successfully exchange two referrals. Later, a guy was offering me to exchange two PTC sites for signing up. After my signing up, he was requesting many things from me to show that I did sign up two of the PTC sites. For instance, he asked for the date and time of my signing up, my signed up and my account details. He told me that the site never want to disclose the exact username of his referrals and this was the first time I had heard. At last, he just signed up One PTC site for me but only clicked 5 out of around 20 advertisements of that site. About the other signing up, he told me that he should try his best to sign up for me. I were angry because if he had no intention to exchange with me, I could exchange with other member whom offered me the same too. He knew about it too. I suspected this guy was purposely to stop other people from participating in PTC sites. He might hate the PTC sites or the Incentria forum very much? Other than these possibilities, what can we guess about him ? Do you have any suggestion to handle this type of people, please ?