I can't get over...?

the fact that my father cheated on my mother with a multipile number of woman. I want to kill him! Im so infuriated. How could he! My mother has done everything for him! Ugh. I can't...just can't. && Now hes saying he wants us to all be a family. I cant cant even speak to him! Ooo so angry. Well this IS between my mother and father I know but this anger and hatred is getting over the top and am afraid I might actually harm him, how could he!? && why!