hey be mature about the situation tell ur boyfriend how these girls make you feel, but don't tell him directly that you want him to stop talking to these girls, just show him how much better and happier he would be with you and hopefully he will see that you are better than his ex's, just be aware don't let him walk all over you and let his ex's intimidate you....if you see that he still feels for any of his ex's you know wat to do!!!