You can crush on someone and develop feelings for someone else. It's not like you can only be attracted to one person at a time. And just because a woman isn't thinking about you in a romantic way doesn't mean she can't or won't.
But that's not the point I'm trying to make, and I definitely expressed the latter part of your post in my OP. Of course those feelings can occur with more than one person, but it's the communication of such feelings that are indicative. My point is that it's quite improbable that a woman who is romantically and consciously interested a man, or thinks of him in that fashion, would walk up to him and tell him to his face that she likes another dude. Who honestly does this? If she wanted to play the field, I think she wouldn't have told the OP anything like this at all.