<human>: I've been indescribably close to this girl since I was 15. I'm closer to her than anybody else. I value our relationship more than anything else however I can't help but have very strong feelings for her. 

We talk nearly every day and have shared our deepest emotional experiences with each other. As you may have guessed from my username I have a mental illness. She is the only person I have confessed the true extent of the problems associated with it to. There are so many instances I could use to highlight how close we are but I won't divulge into that.

I've tried to hint at my true feelings for her in the past but never explicitly stated them. She has never explicitly stated that she doesn't have feelings for me but I suspect that to be the case. She's never been in a relationship however whenever she tells me about her experiences with men and how close she has come to being involved with them it tears me apart. I try to be supportive and offer advice as my main concern is her happiness. 

Lately, I have been unable to think of anything but her and have slipped into a deeply depressive slump. I should be happy that I have the relationship I have with her however I am utterly convinced I will never find anybody as unique and as special as her. I have a genetic disorder which means I look abnormal and as a result I've never had any luck with women. I also suspect that the relationship I have with my friend would be very different if I did not look like this. 

I don't know what to do. Another friend I confided in told me that I should tell her how I feel or else it will just continue to destroy me however I don't want to lose what I already have. She is the best thing in my life and I would be much worse off without her in it.

Can you provide a brief overview of the text?
<bot>: I'm in love with my best friend and she might not feel the same way but keeping it a secret is making my life hell. What do I do?