If His blood is applied to the door of our hearts, Satan cannot touch us. Love involves so many things. Our parents love us so much, yet they have to punish us for wrong doing and lead us in the right path. Because we feel hurt by their choice of correction, does not mean that they don't love us. They are doing what is best for us even though we may not understand it at that time.
Love hurts sometimes.
God created human beings for a means of fellowship. There is no doubt that God and Adam carried on conversations and enjoyed each others company. God did not want Adam to be alone, so He created Eve. Therefore, they could pro-create and produce what would seem to be the 'perfect society'. However, we have the fall of Satan due to him wanting to be equal and above God.