May be a bit jealous...?

My best friend is engaged i am single and i hate guys aproach her more than me, she's got a flirt like character even when she does not mean it, i am very reserved working on my shy personality but i am very outgoing once i warm up. For the past 7 years i never had a problem with her personality, even knowing we have very similar taste in guys. Only until very resent and it is starting to get to me to the point of wanting to split away from her. am i being unreasonable?