I feel like everyone is overreacting to this. I get that you don't feel comfortable in front of the camera. I have social anxiety myself. But the fact that he's even trying to get you to chat with them should be enough proof that this is indeed just a friendship, that just happens to be over skype. Your reaction is clearly why he chose to hide her from you in the start. If he was having romantic feelings towards her, he wouldn't be so open about her to you. He loves you, and not her.

And maybe he just feels more comfortable with an internet friendship? Not everyone is comfortable with getting out, just like not everyone is comfortable with video chatting. That doesn't mean anything, really. It just means he happened to form a friendship over the internet. It happens. Also, skyping and snap chatting have no deep meaning for some people. It just happens to be their way of communication.

Have you ever considered meeting these people? If so, since you're uncomfortable with the camera, let your boyfriend know. Maybe you guys could start out by texting, and then move upward to just mics, and then slowly make way to video chats? Who knows, maybe this could be a couple the both of you could be really good friends with. You just have to give some people a chance.

It's not fair to judge someone you've never met.