Why do girls fake a pregnancy to their boyfriends or ex boyfriends?

good-looking-geek
Why do girls fake a pregnancy or a late period to their boyfriends or ex boyfriends? What do they hope to achieve and what do they want? What do they expect to happen once the man finds out it is false or the man reveals that he knew she was lying the whole time and he was just playing along?
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My brother has an ex girlfriend who was faking a pregnancy. He knew she was lying and he played her game and pretended that she actually was pregnant and stayed calm. She finally gave in and said "I can't keep this up anymore . I am not pregnant."
Why do girls fake a pregnancy to their boyfriends or ex boyfriends?
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