How Can I Hate Him and Love Him At the Same Time?

Oh those emotions of love and hate ! I loved him so much, so much that I loved him with everything and all I had within me. He cheated on me, treated me like dirt and I learned to hate him and what he had become. Why are all of these mixed emotions flowing within me ? Why can't I just get over what he's done? I believe that when we love someone, we love with our whole heart. We give all we have to them. When we get hurt through infidelity, it leaves us very confused. We want to know why or how they can love us, like they say they do, yet still go behind our backs and be with another person. I have a hard time grasping that one, to be honest. My mother always said that actions speak louder than words. Is it true in the case of adultery? What does this say to me?