When someone opens up to me, I consider it a privilege. There has to be trust, or in a councilling situation, confidentiality. In friendship, you haven't got those guarantees, so trust is even more important. And for friendship to work, it has to be reciprocated. When you are receiving support from a friend, it can help to take the focus off yourself and give support along the way. CLKD is right. You can't assume anything.
Dulciana, are you close to your twin sister now? I always envied twins. My sister was 21/2 years older, but I was the nuisance younger sister, shooed away when her friends came round. We weren't close even as adults, still playing childhood roles, until she was ill. So much I would change now. If only.....