I'm jealous of a guys ex-girlfriend but I'm not even with him? Advice please!?

Sorry to say but he still likes her in a romantic way or else he wouldnt flirt with her. Trust me I know how guys work. Sounds like you are his type of girl..with long legs and pretty eyes..megan fox is known for those features. Thing is until his ex is out of the picture you will always feel insecure. You put way too much importance on the looks factor and forget to give yourself credit for your other qualities such as personality and fun factor. Either be the best you can be or just quit right now cause if you keep comparing yourself to everyone that gets in your way you are never going to be happy with yourself. You haven't got the right to worry about his ex as he is not your bf but if you did go out with him and made him fall in love with you then it would be easier to nudge him to stop flirting with her.