quizhunter

I got a question from my friend, it's very difficult for me,
He only gave me some clue about this song,
and I must answer the song title and the artist.

The song lyrics story about:
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Because he (she) was annoyed that his love was unrequited,
he (she) then confided in,
He (she) said, don't ever do what he (she) wants,
if you do it, it's hard to forget him (her),
and he (she) also said don't ever make he (she) as your best friend
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Can you help me find this song?
Thanks before