My friend got possessed by poltergeist?

My friend is 20 years old and she’s always been very active, cheerful, and very popular by guys. She had a short boyfriend 3 months ago, and after that time, she completely changed. She stopped going out, going to the gym, leaving her house or even talking to people, guys or girls. She completely lost her interest in life. She lost lots of weight and became obsessed with books. Suddenly she look at everything like a conspiracy. She stopped talking either. <br> <br>I remember one time she told a story about her old boyfriend. She said that she went to sleep and she woke up in the middle of the night with her boyfriend, looking possessed, who kept saying “I want you, I want you”. She was scared. Suddenly, he woke up and started to laugh and said “What are you talking about? We’ve been sleeping”. My friend didn’t buy it. She was telling us that because she’s sure that weird thing happened to her while she was in a relationship with her ex. <br> <br>I feel deep sadness inside me. I was talking to her a week ago and asked her if she was okay because I was worried about her, but she just said “No, I’m not okay”. She’s been very quiet since then. I don’t know what to do for her. I feel so helpless. <br><br>I really don’t know what she’s going through yet, but I just know that she was a very lively person.