Searchlight - secrets will out, and then you will have lots of questions to answer about the titillating aspects of this "relationship". How can you love someone you've never met? It's like being on here - she could be not what she's telling you who she really is.
How would you feel if your wife told you that she was having a cyber-relationship with another bloke? Keep this up, and you might find out, then you will end up with nobody. It's the thrill of the chase which is keeping this non-relationship alive, IMO.
End it now, before you get hurt. You will feel at a terrible loose end, so pay attention to your patient wife instead.