How to make your girlfriend like you more?

if she is flirting with other guys, like your friend.How to make your girlfriend like you more?
she's problably trying to make you jealous cause your not giving her much attention as you should have been doing in the first place!! let your guard down tell her that it's inappropriate to flirt with your friends she has to do it to you, AND ONLY YOU!! TELL HER STRAIGHT OUT IN THE OPEN!! get her alone in your room or somewhere without anyone interrupting you %26amp; her!!How to make your girlfriend like you more?
If she's flirting with your friends, especially in front of you, then she's probably trying to send you a message.