she is 17 same as boy
they have been friends for about 3 yrs in big group of friends
he's fancied her for ages but she's always told him she only wants to be friends
he has started to become weird now that dd and another boy are clearly about to start going out
weird behaviour is;
phoning and texting too much at all hrs
telling her that she can't go out with anyone else even if she doesn't want to go out with him
telling her that all her friends think this relationship with the other boy is doomed (not true)
arguing constantly with other boy about dd,falsely saying dd really likes him
dd said it's becoming like a huge weight on her shoulders..how should she deal with it?