Then, there are a couple of other explanations. First, it is possible that they were just looking for fun and not serious about meeting in person. It happens. The next possibility is that they are either married, coupled, have someone else or having someone get in touch with them will cause a lot of problems in thier life? Also, they could have some other intentions like manipulation, control, low self-image, etc. Remember, in the internet, they all look great, In person, the faults emerge pretty quickly.