why was Hamilton so deeply concerned about Burr's actions and character?

Burr felt that, among other things, Hamilton defamed his during integrity the 1804 New York gubernatorial race in which Burr was a candidate. You can check out the reasons their quarrel and subsequent duel at the link below.   

http://blog.constitutioncenter.org/2015/07/burr-vs-hamilton-behind-the-ultimate-political-feud/