Most Helpful Guy
Well depending on the reasons for the break up. I mean breaking up sucks, even for the one doing the break up. Unless the person was never in the relationship for anything else other than whatever they could get from you. But if the person broke up with you because they didn't see things working out long run, or they werent happy and didn't see things getting better then they are justified. However if they got with you, slept with you, used you then left you, its fine to be angry. Its part of the grieving process. As long as you dont act on it its fine.
Most Helpful Girl
Kill? You need serious help if that's where your mind is going