Having been here a while, I've seen some really sad stories unfold. As I'm also a sceptic at heart, I usually keep from getting sucked in. At the same time, if it's a person I've interacted with, I do try to be sympathetic and give them the benefit of a doubt. Reading between the lines, it seems to me some of these people have never had the attention they get here. It can be addictive. It's not an excuse, since playing with other people's hearts is cruel. Still, it's easier to let go if I find an explanation.
It's great you work so hard to keep them off site. It would be sad if distrust kept us from finding true friends here. It is a leap of faith to trust an online presence, but they can turn out to be some of the best people you ever met. (Just hope my BFF feels the same way. 😉)