]Bingley and Darcy are riding through Meryton on their way to Longbourn (btw -- Darcy going to Longbourn, oh my!). Bingley wanted to make a special visit to see if Jane were well, and I think this speaks volumes about both his consideration of other people in general and his feelings for Jane specifically.

Yes, it does tell us about Mr Bingley, and his attention to Jane.
(Mr Darcy going to Longbourn! Accompanying Mr Bingley to visit Jane, or perhaps attracted by the fine eyes of Miss Elizabeth Bennet! :)

]In another minute Mr. Bingley, but without seeming to have noticed what passed, took leave and rode on with his friend.
]I take this to mean that Bingley did notice that Darcy was upset (though he may not have known the reason), and that he chose to end his conversation with Jane in order to alleviate his friend's distress.

Thank you! You are right. I missed that when I read the book.

]This passage makes me like Bingley a lot.