Answer:
If we accept that universe had been created by God, then God was alone before the existence of all creations. Although God needs nothing, His natures like love etc, had an indirect need to expose Him. Some thing should be there to know the existence of the God and to assess His mighty. When this need for the creation arose automatically He, the Cherisher and Sustainer, created everything. It is obvious that any creator will love their creation. The system in the universe and essential facilities like wind, water, light, food in different forms, etc., etc., will witness His love and help. He also revealed somany systems of peaceful living through His selected persons among us and asked us to know Him and not to harm others. This is also the other reason to prove His love towards the creations.
God is love and the created us by His love. In a nut shell He loved us into existence. The more you know God, the more you know why he does all the things He does. He created us to love us and to have relationship with us. Many scholars agree this is why we call Him 'Father' because just like a father and a mother want a child to care for, love, and want the best for them, so does God. When Adam and Eve were in the garden, prior to 'the fall" into sin God walked with them on earth and talked with them. When sin entered our lives it separated us from God because He is holy. Thus, the need of propitiation by Christ. Now those who have faith can communicate with God. Even while were or are still in sin, He still loves us, but the relationship is hindered, and if we don't accept the sacrifice (Jesus), we stay eternally separated. Hope this helps. Be very blessed.