I wish I knew how to be a good buddy. But I definitely don't. I certified in the 80's while at college inland, then dove on a remote part of the Oregon coast thereafter since it was near home and my favorite place, and a buddy was never a thought. I didn't know a single diver in the area or even in the state. Dive plans weren't an issue either, since I was exploring. Off the shore, down twenty feet or so, come up when the tank got low. Shore support from family was important to me when available; a buddy wasn't.
When we had kids, they got certified, and I dove a little with each of them, always watching them like a hawk, but that wasn't a conventional buddy experience.
In my late 50,'s getting back into diving , I went to Mexico and did a boat dive while on a largely non-diving vacation with my wife. My buddy was an incredible young woman from Texas who had perfect bouyancy and trim. I liked being her buddy just to follow her and try to learn how to dive well. But I did also wander around the reef some. Not past where I could see her, but a ways off at times.
Back home, I took some classes. One was a dry suit class. That class made it clear to me that I had physical fitness issues and anxiety issues (the former often causing much of the latter), and also some claustrophobia issues I'd never had before my fifties. I bailed on that dry suit during my first pool session, due to anxiety and hating the neck seal (which seal I trimmed down shortly thereafter). In the open water session, our instructor wanted me and two young women to swim around together for twenty minutes. Thing is, it was a mudhole. I couldn't see anything, not even my hand unless it was close to my face. The only way to not lose track of a buddy was to physically hold onto them, and that wasn't something that seemed like a good idea. So it wasn't much of a dive.
Then came a deep dive class, which well and truly sucked. I was tired on the surface, and nervous. And it was a high altitude dive, which probably didn't help. My mask seal wasn't good because of my beard. I'd only had the drysuit a short time, the dry suit class being it for my experience in the drysuit. My buddy was a lady in the class who came with her extremely vocal DIR husband who was constantly correcting her. She was really nervous. When it was time to descend, I dumped all my air and started slowly down, since I wasn't overweighted and so could only go down slowly. Turns out she was overweighted. She dropped out of sight almost immediately. I tried to invert and kick to follow the glow of her light, but then got ear pressure and mask flooding issues distracting me. It was a complete cluster. Her husband was with her, and the instructor chased her, and I stopped in midwater and tried to get a grip on things. Then I surfaced and they surfaced, to discuss a second shot at that first dive. However, I bailed and went home. This was traumatic for me because I didn't think of myself as a weenie, and hadn't been one when I was young. Running away isn't my thing. I'm painfully aware that I was not taking the baby steps to get back into diving that I should have, and that I was pushing past both my training and general abilities, in unsafe ways.
That said, my instructor told me later to never leave my buddy. I certainly didn't argue. But I did think about how 1) I didn't really leave her, she left me, although my own failings (and equipment issues) kept me from boldy charging down after her; and 2) I don't even know how to be a good buddy when I'm staying next to someone. I've had rescue class, and I'm clear on doing whatever I can to help someone in trouble because that's my job as a dive buddy and as a human being. It's more the mundane details. Sorry about writing so much, but this has bothered me for over a year now, and I want to get it off my chest. Unfortunately, I get the impression that maybe I'm not an unusual buddy, but a typical one. A lot of non-Scubaboard divers seem to be in some version of the same boat, so to speak, as me. I'm increasingly confident in my own diving, but I sure don't know how to be a good buddy, including when to abandon someone.
Maybe it's just back to solo diving. I'll probably travel for some Puget Sound diving this winter. But in the meantime I'll follow this thread, because some constructive ideas would be really helpful even if it is something of a rehash of a perennial topic.