I really don't know how the ship "Bamon" developed because there is no reason for them to be romantically involved. They are cool as friends but nothing else!
I have been re-watching season one of TVD and it makes me think. Has anyone ever considered that Stefan would have been an option rather than the ridiculous notion of Damon?
We see from the very first episode that Bonnie has a crush on him. I don't know what to think about Steroline since it's early days but I did think they were cute in earlier seasons when they bonded.
I doubt that anything would happen between Bonnie and Stefan even though I would like to see it...out of curiosity :)