you do not need to use on line dating! for one it's dangerous. people can say one thing and be another. Two you don't need to! you can go out and meet a nice girl, woman, man , pet dog what ever you...
that depends, is he single? if yes, leave him to it, its none of oyur bussines. maybe he's jsut lonely. If he's still married on the other hand, he's just looking for a new mistress or whatever...
That depends on what you are looking for. There are different types of dating sites. Check Sources and Related Links in case anyone has added website links there. However, Answers.com cannot...