If you've never met the person, you're only in love with the persona they put out on skype/whatever program you use to chat. You in reality don't know the real person, or if you'll actually love them.
There was a sad story about a guy on here a few months back that flew to some country to meet his LDR girlfriend for the first time, he planned to stay the week. By the end of the first night she didn't want to see him at all anymore, by day 2 she asked him to leave and didn't see it going any further. I think it was a long term online relationship. It was a valuable lesson into what can happen when you actually meet face to face the first time.
"All is fair in love and war." - Francis Edward Smedley