<human>: So there's this girl I've been friends with for quite a few years now, whom I really like. We share the same interests as do those in our circle of friends: reddit, vidja gaims, music, comics, movies, drinking(more recently) etc. Girl is more comfortable around guys, nobody really holds back around her: shes pretty much one of the guys now.

She has shown some interest beyond friendship in me years ago, but claims to have been being foolish during those times, and that her urges really meant nothing. I have proposed an fuck buddy thing to her in the past which she agreed to at first but then eventually changed her mind and saying that it would be weird. She sometimes compliments my body on how I've gotten more muscular or whatever. Recently told me during one of our talks that she is a pansexual.

About these talks:  she has been through (and continues to go through) some bad family shit and struggles with depression and anxiety. A few weeks ago she started telling me about her disorders, and basically telling me super personal shit she doesn't even tell her counsellor/psychiatrist.

I've had a thing for her for a long time but was too much of a coward to ever say anything.
 I badly want to tell her how I'm feeling but at the same time I'm sure that she would not feel the same and I'd rather not lose that special trust. Nobody has ever felt so safe with me to tell me the things she has, but if she knew how I felt I don't think she would have. 

So. What the fuck should I do? Do you, o reddit, think I should say how I feel (Planning on doing this tomorrow, feel like if I don't I am somehow being dishonest) and let what happen happen, or just stfu to preserve her trust in me and this friendship? I haven't spoken of this to anyone. Need some perspective. Please advise.

Can you summarize the given text in a few sentences?
<bot>: I'm a tool who is romantically obsessed with my friend who treats me as her confidante in deeply personal matters and I want to tell her about it