Is it wrong to fake an illness to get a girlfriend?

my cousin recently returned from college abroad after a year and a half now and caught up with a woman that he didn't go to far with before he left. When he saw her again for the first time he claimed he did not remember her(something about a car accident and memory loss while he was abroad) and the thing is that she believes him. My cousin recently asked me for advised on what to do next but I don't know what to do. On one hand I would like to help him out because he is family on the other I would like to find a way to tell the woman the truth???