many a times just avoid the gal for few days if she comes back to you then you can try again or else just let her go
90% of the time if a girl wants to just be your friend that simply means she doesn't care for you romantically. But I think you need to clarify your question a bit more. What did exactly happen in your case?
Girls and me in friendzone? If it's not with benefits then no thanks. I will be friends with who is female that I have no feelings whatsoever but if it's certain of girls that I do have a bit feeling for then I would tell them this "Ya know, it's either that you want more than a friendship or drop the friendship deal". Maybe I am a bit harsh but my emotions isn't there to be played with especially from what I have experienced quite a lot of times. Let me rephrase this I am willing to be friends with some of the females but not the females I have once dated because if we break up and then become friends? Yeah, like that would work.
it depends on what you are asking do you like a girl and she wants to only be friends? respect her and be there. If you really like her she will eventually notice how much of a good friend you are and how much you care about her (this what happened to me) if a girl likes you and you don't like her, still be friends but make sure you don't do anything that will lead her on. but if you want to know if you are in a friend zone or see if its more. talk to her and see where she is at. Tell her about your feelings if she is a good friend she would not be bothered and nothing should change, you will have to just be patient with your feelings. if she starts acting weird and starts ignoring you then she wasn't a good friend to start with and your relationship was not that important. Its tough but nothing is better then open discussion honesty. You may loose a friend or two i the process but you get better friends and maybe who knows like me a wife and two kids in the process. but i won't say it doesn't hurt because it does but looking back its the best way to live.
In my opinion it usually means your a person in a girls life that she doesn't want to loose and relationships can ruin those friendships that are too important to loose.