She keeps trying to break me and my boyfriend up! Ugh I'm so p*ssed! This girl just won't stop. Help?

She keeps trying to break me and my boyfriend up for as long as we have together (a year and 10 months). At first I ignored it until she started trash talking me and trying harder. I told my boyfriend how I felt and he just said he's "been friends with her for a long time" so he won't stop talking to her. But it really bothers me, any advice please?
She keeps trying to break me and my boyfriend up! Ugh I'm so p*ssed! This girl just won't stop. Help?
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