In my experience, all of the bettas I have brought home have been timid and perhaps even terrified at first... but they gradually warmed up to the point that they would fearlessly come up for food and I've managed to "train" all of them to swim into a cup when I need to move them (I live in a dorm and need to take them home periodically).
Then Hal came along... and he's trumped everything. I've had him almost a month now and he's still very reserved. It takes quite a while for him to actually come forward and retrieve his food pellets, and he swims away as soon as he's gotten one, waits for maybe a minute, and then comes back. I have to take him home in two weeks and I know with his current demeanor there won't be any coaxing him into a cup... which only pains me because I truly do not want to have to chase him down with a net. That gets so traumatizing and it risks tearing their fins... so I have no idea what to do.
Has anyone else here had a betta that has been stubbornly resistant in such a way? Will he ever come around?