My bf’s ex girlfriend was copying my poses.?

There is a possibility that she just happens to pose the same way in pictures as you do. Most girls take the exact same photos of themselves, because they are the most flattering to them. But if she IS copying them, it could be her way of coping with the fact that her ex is with someone else. I know its weird, but when we see something that works for one girl, we all try to copy it. Its messed up, but that's what media is, a model for us to copy. Think of your public Facebook photos as another form or media, which they are. She is copying them because it works for you. As creepy as it is, just feel flattered.

it's possible that your boyfriend likes you because your very similar to his ex-girlfriend

AnonyMissAnn couldn't have put it any better. Its simple as that. Or maybe your poses are generally used and its just a coincidence that she happens to use them. Take a browse on some social networking sites, you're bound to find similar, if not, identical poses throughout the pictures.