Can a confused consent be termed as rape ?

It is regarding a friend... He was dating a girl and they have been in live in relationship for 4years. They aren't together anymore and it's been many years now.. both are seeing other people. But they suddenly started to talk and decided to meet once.. this is where the problem begin... The girl invited the guy in a hotel where she was staying. They had some beer and started to kiss... The girl mentioned a line to the guy " I have a fantasy of getting raped" . The guy thought it's her signal to involve in the act. During the act the girl didn't say no but she seemed lost. They didn't had intercourse because the guy somehow sensed that she isn't really into the act and thus he left her room . That following night the girl started charging the guy of raping her. Because a girl thinks it is rape the guy saud sorry to her... Now she is using those msgs where he apologized to her ..against him so that she can blackmail him. Its has been more than 6months and this blackmails have continued. She keeps on asking him to meet her otherwise she will go to the police. Is this ethical ? Just because a girl has her right can she missuse it and term it as rape and take control? .... Or should the guy take some legal help ? ???