You needn't always think of things from another person's view. Everyone is human. You will usually only think of the good things you have done or the bad things you have suffered.
But, when you know that you have done the worst possible thing to someone, hurt them and treated them badly for years together, and yet you think it's okay to shout at them when they react to your callous selfish disrespectful abandonment of them, you really need help.
If you can't find in yourself enough remorse and humility to at least realize that since you have done so much wrong, the other person is bound to get affected and react and the least you can do is handle that reaction, if not apologist and promise to make things better, then I don't know what kind of human are you.