Yang Ruifang worked as a secretary in an Australian company in Melbourne .She became friendly with one of the Australian secretaries, a woman named Cathy Lane .The two usually ate lunch together and Yang Ruifang often asked Cathy for advice on problems she faced adjusting to Australian society .Cathy gave her a lot of advice and helped her move from one apartment to another .Cathy went with Yang Ruifang to the Immigration Bureau several times to help sort out some problems .Yang Ruifang visited Cathy several times at home but did not invite Cathy to her apart ment because she shared it with four other people .If they did not see each other over the weekend ,they usually talked on the telephone .As Yang Ruifang was also preparing to take an English test, she was able to get a lot of help with English in this way . However ,something seemed to be going wrong, Cathy seemed to be getting impatient, even a little cold .She start ed going out by herself at lunchtime instead of eating with Yang ,and seemed reluctant to answer questions .Yang Ruifang was puzzled, She couldn ’ t imagine what the problem was . Question: What was Yang Ruifang doing that made Cathy decide that the relationship was not a true friendship?