brutus's dilemma

If I were Brutus, I don't think I would chose to kill Cesar. My reasoning is as follows:

1. He proved himself a good leader many times over.
2. He proved himself a good general by defeating Pompey.
   
3. When he was city counselor he hosted several public events.
4. He rose to power justly.
5. He was also 'my' friend.