<human>: I've known her for over a year and a half and we hang out almost everyday. We have helped each other with depression the entire time. She's been in a failing long distance on/off relationship the whole time and I feel like I emotionally helped her cheat (not on purpose). On one of their 'breaks", I asked her out and she stalled and said "I don't know" and eventually said no. Later she said I had a chance. That was 9 months ago and she's still has yet to permanently break it off (shes technically single). 

The problem I have is she makes all other girls look like shit to me because her and I are extremely compatible and she has everything I want in a girl. I'm not in love with her but I want to move on. I feel like I need to distance myself but she's depressed and I'm one of her only friends and I probably wouldn't even be here today without her. I can't just abandon her. I want a girlfriend but I haven't found anyone close to the kind of connection I have with her. I would date her but I can tell she doesn't feel the same about me. I don't know how to handle this

Can you give me the gist of the text in a nutshell?
<bot>: My female best friend is so perfect for me that it makes all my other connections with girls seem shitty. She's unavailable and very depressed so I can't distance myself or ask her out. Should I tell her this?