Let us now look at how the relationships between some of the characters have evolved:
1) Elena And Bonnie
Bonnie and Elena have been and still remain best of friends. Bonnie is a witch and Elena is now a vamp, although Bonnie is still not too comfortable with vamps. Bonnie is the cautious one even though she is boy-crazy. She just does not like Stefan with Elena.
2) Stefan And Damon
Brothers, they are both struggling in their lives. Damon is trying to forget the past, while Stefan is trying to mend his ways. And finally, have stopped fighting over Elena.