by march 1994, mark decides to end the relationship but when he tries to break it off, shelley resorts to emotional blackmail and says that if he left her, she would fail her exams. when this doesn't work, she resorts to begging, crying and emotional pressure, saying that she has risked her health being with him, so he owes her. after one final irrational outburst – where she almost publicly reveals that mark is hiv positive – shelley finally realises that the relationship is over and decides to leave walford in march 1994.