She accuses me of ignoring her and ditching her. Why does she say this?

I've known one of my closest friends since the 6th grade and we are entering 11th this year. We have been close friends from the start. The thing is that whenever I have a boyfriend she accuses me of ignoring her and ditching her. She also says that I'm only friends with her when its convenient for me. I don't think she understands that I need to spend time with my boyfriend apart from spending time with her. Sometimes she takes it to extremes like calling me profanities and 'unfriending' me. Why does she act like this?
She accuses me of ignoring her and ditching her. Why does she say this?
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