when the ex had more privileges

So just tell me if I'm being completely nieve or not.. My fiancé told me that his EX fiancé would log onto his Facebook account all the time.. Yet he doesn't let me do that. There's a lot of little things that he brings up about his ex being able to do and he doesn't let me do. Ugh, I k ow I'm being way too jealous, this doesn't deserve any worry on my part right?