So, I know that at least, when it comes to me, I get very jealous when someone I care about pays attention to someone else. It makes me feel like I'm not loved. Realistically, I know this is silly, and I started wondering why I feel that way.

Sorry if this was obvious to everyone else... but it just occurred to me that I, and others that feel this way, could be projecting. This is because it is common for *us* to have a sole attachment, so we assume others must have one as well.