frenemies

so i found out two days ago that one of my friends (who helped me get started freelancing) is now trying to steal work from one of my best clients. she used to work for him and hooked me up with him as well, and then about a year ago she stopped working for him and now she just emailed him a few days ago saying she wanted to work for him again, and basically could he give some of the projects he gives me to her instead. and the beauty is, he and i are on such good terms that he told me and then he told her no. with friends like these...