Unfortunately there is nothing you can do or should do. They are obviously with someone that they want to be with at this time in life and it is best that you move on and let them be.
No.
tell him you love him but u know ur goin out wid someone
Of course -- but it will be a challenge. If you love someone and they love you, other people's opinions of your girlfriend shouldn't matter.
Well if you mean by age?!?! love has no age.
It means she's not your girlfriend any more.
He does not love you, he just wants to use you. DOES HE LOVE YOU? ARE YOU NUTS? IT'S EASY. IF HE HAS A GIRLFRIEND, THEN HE DOES NOT LOVE YOU. IF HE DID HE WOULD ONLY BE WITH YOU, NOT MATTER WHAT. YOUR GOING TO GET HURT. BUT YOU SHOULD. WHY ARE YOU WITH SOMEONE WHO IS INVOLVED WITH SOMEONE ELSE? HOW COULD YOU EVER TRUST SOMEONE WHO IS SEEING YOU WHILE HE IS WITH SOMEONE ELSE? HOW WILL HE EVER BE ABLE TO TRUST YOU? HOW CAN YOU HAVE ANY RESPECT FOR YOURSELF? HE DOESN'T, NOR DOES HE HAVE ANY RESPECT FOR YOU OR HIS "GIRLFRIEND" (WHICH YOU ARE NOT). JUST REMEMBER, YOU GET WHAT YOU GIVE.
you wait until their relationship is at its lowest (maybe)
No,I Love Someone Else
U should go up to him and say u love him and tell how you feel
You action could be term double dating. This is against the rules of relationship. You are only permitted to do this when you are no longer in love with someone.
He could be, but he's not allowed to have a girlfriend.
Be honest with your girlfriend. I have a friend who has a girlfriend but he is in love with his best friend, the longer you leave it then the harder it will get because your feelings for this 'someone else' will not disappear. Depending on how long you have been with your girlfriend it is the time to think whether you will later regret your actions or have any feelings for your current girlfriend. But in this case honesty is the best policy because no girl would or should be lied to if you are in love with someone else then tell your girl!