That's just called a friend roll
i can't believe i didn't think of it.
i don't think i can act that way towards any of my friends, I'd feel selfish if i burdern them with my problems. they have plenty of their own.
I have a close online friend I've known for almost 10 years now that I can talk to about anything. I often feel bad for burdening him with my (mostly self-inflicted) problems and appearing overly negative, but he does the same with me sometimes, so there's an understanding there.
I don't think I've ever thought about him as anything like a fake boyfriend though.