Fade away from her?

im going to start distancing myself from the girl I overlove. We became best friends. I don't know if this sounds selfish, but I can't take it anymore. I am an overthinker and have anxiety issues and she doesn't feel the same way, sometimes I raise my expectations and get disappointed. Its like a vicious cycle: I raise expectations, then the reality comes, I get sad and want to fade away, but then time passes and I start raising expectations all over again.

How do I fade away without ruining the friendship? She has depression and sometimes she vents to me, how could I deal with that? It's not that I don't want to be friends anymore, she is a complicated girl but I do like her a lot, but my expectations prevent me from having a healthy friendship.

Fade away from her?
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