I cannot state this clearly enough: if you really believe in equality, then you have to acknowledge the fact that women have a right to say no. That no matter how pure and true your feelings, your ladylove is under no obligation whatever to reciprocate them, because friendship is not a business transaction, and women are allowed to want male friends. Yes, it is difficult and sad and heartbreaking to love someone who doesn’t love you back, and doubly so when that person is a friend. Believe me; I speak from experience. This is not a fun thing to endure! But discounting the woman as a bitch, a user, a timewaster, a whore with no taste who only wants to sleep with arseholes instead of Nice Guys like you is not on. It is pure, unadulterated sexism: the attitude that friendship with a woman is only ever a stepping-stone to getting into her pants, such that if the pants-getting is off the table, then so too is the friendship.
An excellent article, which also very handily links to statements made in other excellent articles. Well worth a read.
Pro tip. If you’re thinking of your female friends as bitches and users because they don’t repay your nice behaviour with sex? You’re being neither nice, or a friend.