This battle is so emotional. These are two friends who are like brothers, fighting. He only did what he did to save the love of his life from dying. And when Obi-Wan says "You were my brother Anakin... I loved you" I can't help but cry a little wishing the ending was different.
“Isn't it painful to know that there are things that you would never be able to return ever again? Isn't it consuming you that there could have been another way, and yet you choose the other choice you thought was right?”