Why does my boyfriend have 2 fake facebook accounts with 2 different emails?

So I just found out that my boyfriend has an extra facebook account, he had told me before that he does have a facebook account with a fake name (that he has for quite some time) I looked for it with his email and it’s true no content on it whatsoever, but I recently wrote down his other email that he was using the other days and I got a glance wrote it down, and I also looked for it on facebook and guess what there is another account under a fake name as well, but this time its with a profile picture of himself, which is actually very very weird since he hates taking pictures (believe me back in Thanksgiving that was a dilemma he did not want to take pictures with me because he ’’ hates’’ pictures and so on) anyway I don’t know if I am overreacting, but since I have always felt that he is quite mysterious, this is the cherry on top and know I am beginning to think what can possibly be going on.