The day that I think changed our relationship we went on a hike together. While we were driving there he had a bunch of anxiety about it, and wanted to back out. I managed to convince him to come with me and just let all his feelings out; he just yelled at me the entire drive there about a lot of different things. Including my treatment of him.
That hike to this day was the best I've ever been on. Everybody has a different relationship with their brother, but I genuinely do not and cannot imagine this existence without mine. He understands me in ways that nobody else does. He gets my jokes that nobody else does. Having a brother you are close with just _almost_ proves you don't die alone.