rls advice

my bfs (virgo) ex gf (pisces 2 my knowledge) keeps inserting herself into our relationship. a couple months ago she called him asking if he was single knowing hes in a relationship off a textnow number which led to me telling her to back off. On jan 11 she called his mom asking if she's okay & that she didn't want anything & when my bf told her to block the ex gf she said she isn't. the mom is also a pisces, im an aries. it doesn't have much to do with signs i just dk how to go about the situation im healing & don't like conflict.