It's not that simple, Stefan. Two of my brothers. Would you be able to move past someone killing Damon? Okay, let's actually use an example that would apply here. Damon has something Marcel wants. Marcel kills Damon for it. Marcel is one of the very few people I have ever loved. How do you react?
He has had some horrific things happening to him though. It's complicated. And it does hurt that he went from joking about our childhood with me one day to less than a week later deciding he wants nothing to do with me any more.