I feel for you. You sound like a fairly level-headed and together person. Is this young man still living at home? At 22, if he is a good JW, that is to be expected. But it will mean that while he will be a very nice person, he will also be acres behind you in terms of life experience and maturity. That might not come across at first but it will be there. Aside from that, the religion has the potential to be a huge deal. I wouldn't go so far as to say "RUN," but oh boy, be super super careful and don't make any quick decisions.
One other thing--generally, the number of single young women outnumber young men by about 10 to 1. In most congregations, young single men, especially if they are half-way good-looking or intelligent, attractive, etc., have their choice of girls. Which raises the question as to why he is seeking female companionship online. This in no way is meant to suggest you are not attractive or anything like that--of course! But it is just another flag. I'm just saying this in general, not trying to imply anything about you personally.