You're already deep in the Fz. The only time a woman is not ready to get sexual with a guy she is into is if there is something physically wrong with her; doesn't mean she'll give it up to every guy she is attracted to of course, but there is little difference between men/women when it comes to horniness etc.
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I don't really want to jump in and try my luck
Then be content to stay in the Fz.
I think you are not partaking in the abundnace of females that are available to you because you seem hung up on this one that you are friends with. Make a move with her or better yet meet more women; either way take some action. Respect yourself enough to know that you deserve more than the Fz; if she rejects, so be it.
The mere fact that you are her shoulder to cry on time and time again is Friendzone City. MOVE OUT OF THIS ZONE IMMEDIATELY.
Best wishes to you mate.