The non-face to face kinds of relationships are tricky. It is way to easy to form an opinion based on which side of the fence we are sitting.
Do I think you've done anything wrong? Nope. I do think it is a slippery slope so continuing on at the current level of intensity is unwise IMO. Certainly there has been lots to think about and learn that has already been stated. Some powerful signs have come to light.
Here is the catch 22 - if you posted that your husband had been doing this I'd probably have a very different response - one that wasn't quite so understanding. It is what it is. In general - if our actions are not OK if done by our spouse - they are not OK if done by us either.