Why Does He Still Need Me?

He cheated on me, and that tells me that he wants to be with someone else. Either that, or he thought that he could have his cake and eat it too !! He is the one who went looking for "the other woman". He is the one who stepped outside our marriage and being with someone else. He ripped open my very soul, stepped on my heart and yet he wants to still be with me? How could he think that I would accept what he has done? He just wants me to forget about what he did and keep on going on like nothing ever took place, and not only that, it hasn't been a one-time thing, it had been on-going for years. Not only that, but he said that he still needs me. He wants me and I don't understand. Why would he be calling me, asking me to help him out with things he cannot do now that we have split up? Does he not understand that he has hurt me?