<human>: Can you give me the gist of the text in a nutshell?

Hello everyone, I'm feeling really awkward to post here but I really wanted external opinions/advice/thoughts..

So I know this girl since late 2013, but our frienship really started around 09/2015. I'd say she has been my best friend for a year now, didn't really had one before that anyway.

Six months ago I confessed about my romantically-inclined feelings to her, even though she's been with the same guy since 09/2014. She just laughed it off at first, then told me she didn't want our friendship to end (we go along very well, making the other laugh on a daily basis on our 60k+ messages long FB conversation). She didn't want to say that we'd be just friends forever either.

I was kind of confused by the situation I put myself in. After that one party where I saw them together again, I completely broke down and ran back home in tears, kicking & punching the walls. Stopped all conversations with her for about a week. Then got into the friendship again, like before. 

I don't want her to be just my friend, neither do I want to jeopardize our friendship because of some drama I built up on my own because of overthinking stuff. I can't help to imagine possible scenarii when she complains to me about her boyfriend, about stuff he's not doing right etc.. Then I proceed to feel guilty.

At times I think she's the best thing that's ever happened to me, and at other times I just can't even stand her presence and become angry. Should I do something ? If, yes, what would that be ? I really feel I can't move on in my life if I don't get a definitive answer from her, and that sucks.
<bot>: My best friend for 1 year is also my crush. I confessed 6 months ago, situation hasn't evolved. I want to do something and I need advice.