If she is your EX girlfriend, the she is nothing to do with you any more, do as she asks LEAVE HER ALONE to make a new life without you.
If a boy has a girlfriend then he is considered taking and you should leave him alone and later he may break up with his girlfriend.
Leave her alone.
Leave them alone together. Find someone else to like.
Leave them alone!
obviously, she doesnt love you anymore so you should just leave her alone.
Leave them alone ! YOU have no right to interfere in their relationship !
You leave him alone until he is not attached.
tell on him and tell him leave my girlfriend alone.
Say. Hey! Can we have some privacy please, And if they don't leave, just go away. If they follow you, go into your house or her house. That should work.
get a big buff black guy to tell him if he doesn't leave her alone he'll beat him.
The best answer is "Fine, I'll leave you alone." Then do so.
Tell her to leave you alone; if you like her back, don't drag your girlfriend along.