Yup, same here. Interestingly enough, I managed to attract a best friend who is just as jealous. Like when I was going out with my girlfriend, she hated her. She said, basically "It's not that I want to sleep with you, but I don't want another girl to do it either. You're mine." She likes hubby though and we joke that I have a husband and a wife (or that he has two wives). But any time I see her mention that she likes someone else, I get pouty and upset. Once upon a time, I considered her my best friend but she still considered this other girl her best friend, so I stopped speaking to her (without telling her, because I knew I was being stupid) because I was so angry and jealous. And when I did speak to her, I was snipey and bitchy.

And yeah, I hate finding out someone doesn't like me as much as I like them. Or worse, that the really DON'T like me :(