It is easy to feel an attachment over the internet but such relationships are not a reflection of what they would be in real life. It is easier for people to behave in such manner (ie. just walking away with a cold shoulder or snub) when they are not dealing with face to face contact (I do not consider skype as true face to face contact). But, that doesn't discount the emotions, including pain, felt. They most definitely are n fact valid. So what I am trying to say is that it is okay to grieve this loss, but it certainly is no reflection on you.