have you ever pertended to be friends with some one just because you need their help?

we used to be good friends we were more than friends but now dont want her around i wish she disappears off my life somehow, she changed we dont talk alot lately and when we do it turns into an argument she has some really trust issues always have to ask about details and when i ask why all the questions she doesn't answer me she just says nothing.
the only reason i am being friends with her cuz i will need her help but when i am done i will tell her how i really feel