Riley was instrumental in destroying Faith. :) Riley made Faith realise her life was empty and meaningless, and after leaving him her only wish was to kill Faith and become Buffy.
Riley helped destroy the Faith that Faith never really wanted to be. Faith's life was empty -- and she wishes to kill herself because she doesn't believe she can ever actually be a good person and have a good life. Angel helps her realize that she can, and because of that she emerges from the series a much stronger and healthier person than she could ever have thought when she first showed up in Sunnydale.
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Riley helped destroy the Faith that Faith never really wanted to be. Faith's life was empty -- and she wishes to kill herself because she doesn't believe she can ever actually be a good person and have a good life. Angel helps her realize that she can, and because of that she emerges from the series a much stronger and healthier person than she could ever have thought when she first showed up in Sunnydale.