If you have seen a picture of himself on his camera and a picture of an unknown girl on the computer I hate to say this but it "looks" like he's def getting to know someone.
I say that because when Tommy and I were getting to know each other we sent pics of one another. I never cheated on the ex but hr did see me opening a pic of Tommy in te early days and got furious. I guess he was smart enough to figure out that there was an attraction there if we were exchaning pics.
I just don't want you to dismiss the cheating thing incase it does happen. Or maybe he's lying about having not met anyone when he really has.