Guinevere Jones S02E04 - Wishes

When Josh makes a half-serious wish to get Gwen back on an ancient amulet, he discovers to his initial joy that his wish has come true: Gwen is suddenly so devoted to him that she's even willing to give up the magic that has come between them in the past. Ultimately, though, Josh can find no happiness in a love that isn't real - but finds to his dismay that, in her determination to hold onto their relationship, Gwen has destroyed the amulet. It seems there is no way to take back the wish, and Gwen's personality will be altered forever.