If a woman aint feeling you, there is nothing you can do.
You are on point, but not all the times is the door closed. I've seen girls who weren't feeling you at first, all of a sudden open the door for you when you least expect it.
Sad to say, that most men have blown opportunities like this, including myself. Now if I had the knowledge I have now back then, then I would banking on those missed opportunities.
However there are some that once you're labeled "friend" then there is nothing you can do like you said, however that's why you don't invest all of your stock in just one just incase this scenario happens.