HELP!!! Girls disrespecting boundaries!

Ok so my boyfriend and I have been together a while but so many girls hit on him. They call him babe, baby or pretty boy over text, and always asks if he’s still with me. he told me that he tells them to stop, and for the most part I believe him..... but I don’t wanna confront the girls because then it will be this whole dramatic thing. they know we are together and won’t respect our relationship. what can I do to make them stop?! my boyfriend said they haven’t done it in a while, but it still makes my blood boil.