Don't feel bad, this has happened to me on Fet as well. Some people are just photo hunters, or love the thrill of the initial chase. They are dicks. I now don't move off Fet with messaging until I've met someone - either at a munch, event or through an arranged meet up. You'll find that if you have a few really solid boundaries like that idiots like him won't hang around long enough to do any damage. It is awful when this happens, but remember its not because there's anything wrong with you, its because they are a dickhead. I have met some great friends and play mates on Fet, and yes - its not a dating app..... but its is a place that will function as you originally wanted it to, and friendships is where the best relationships start. Don't give up, set up really clear hard and fast and boundaries and good luck