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

I feel like I'm about to watch a friend I care about self destruct and "crack" for the second time. They've told me they want to be left alone and I'm desperately trying to respect that, but I'm so God damn worried about them it's almost impossible. I worry about people innately - I just can't help it. He's my friend and I care about my friends selflessly.

They have physical and mental health problems they're practically refusing to address. They've had so much bad shit happen in such a short period of time. 
They're the sort of person that tries to take these things on their own and keep others out. They want to fix their own shit, which I fully approve of, but I know how much pain they're in. 

Problems are involved that I can't really relate to but I know what it's like to try and tackle things alone. It just doesn't work. They tried that once and it backfired. Bottled everything up and ended up snapping - rocked up to my house practically catatonic one night like I know they would eventually. 

I know I can't save them. I can't magically fix anything. I know I can't force them to talk about it. All I can do is say I'm there for them when they're ready.

But it's next to impossible for me to stand back. I don't want to interfere or stick my nose in when it really isn't wanted. What the hell am I supposed to do?
<bot>: worried sick about friend and it's difficult for me to stand back. Need advice re: backing the fuck off and leaving them alone, even if it's near impossible for me.