Guys who wind up in the friendzone weren’t looking for some kind of one night stand. If they’re going through the trouble to get to know the girl closely, they’re hoping to get her to like him enough to consider being a steady boyfriend. Who the hell befriends someone for months, if not years on end, for the hope of one session of sex?A girl who keeps a boy who wishes to be a boyfriend in the friendzone is a user. It's that simple. Don't permit yourself to be used in such a manner. It's fine to be friends with a woman if you don't treat her any better than you would your male friends and you don't harbor any more ambitions of bedding her than you do of them. Otherwise, you're much better off, and much more likely to get somewhere with her too, by flat-out refusing to be relegated to orbit.
And that’s considering that these girls really don’t suspect that the guy is interested in her which is usually bullshit. Girls like this are pretty sure the guy is interested and that’s why he is so supportive and giving of his time and energy to her. Why he’ll selflessly do all kinds of favors and listen to all her drunken stories and pretty much be the perfect companion.
What pisses these girls off about the friendzone is when the term comes up, it’s when the guy realizes that their relationship isn’t going to lead to something deeper and the gravy train stops. Because he’s not going to just keep giving freely for no reason. Friendship is a two-way street where both sides support each other. Not just one side which gives and gives like a happy servant.
The reason these girls get mad isn’t because he hasn’t been thinking of her as a friend all this time. It’s because he’s only going to think of her as a friend for now on.
I'm not saying to make a scene or present an ultimatum or create drama. That's only going to feed her sense of entitlement. Just be friendly, civil, and totally unresponsive to her overtures.