If you know he's already taken,leave him alone.

More than you think.First of all,when you flirt with another girls boyfriend,especially a girl who is in your school and maybe friends with some of your friends,you're wearing a sign.The sign says,I go after What I Want No Matter What.
      You might think your good friends know that you would never try to steal their boyfriends.But that's not the point.It doesn't matter whether the girl is your best friend or not.Her boyfriend isn't fair game until they break up.
   Going after someone else's boyfriend is like saying you don't value other people's feelings and boyfriends count more than friends.Your good friends would hope you wouldn't do the same to them,but they would stop trusting you as much as they did before.
  Second,what about this couple?Relationships are scary enough.Anyone can get hurt.Do you really want to be responsible for breaking them up?
  What if you do get him in the end?Not too many people are going to be happy for you.Your friends might avoid hanging out with you and him for fear of hurting his ex-girlfriend.They'll have to choose sides.
   And what if you don't get him?You'll be embarrassed.You may have lost a few friends,and you'll have nothing to show for it but a bad rep.
 So stay away from other girl's boyfriends.If they aren't meant for each other,they'll break up.Then you can have a chance with him.By playing it straight,you'll feed good about yourself and better about him.Why would you want a guy with a wandering eye,anyway?If you were able to steal him with a little flirting,maybe he's not very good at being a boyfriend.He might leave you just as easily.
    Or he might be the boyfriend of your dreams-someone you'll grow to really cherish.You may even stay together a long,long time.And relationships like that are worth waiting for.