Because he first loved me is my answer as well.
He knew me when I was "knit together" in my mother's womb..cf Psalm 139.
He loved me before I could talk and when I could only make funny noises or cry or when I took my first step across the kitchen floor and reached my daddy's waiting arms.
He took care of me and provided guidance and love when I was little and would reach way up to take my own father's hand.
Through the devestation of war and loss of loved ones God protected me and my family.
He gave me safety while traveling across a country into a new place where I knew virtually noone but my mother and father.
He was with me when my Father went home to be with Him at the age of nine.
He provided surrogate parents for me when my own mother was not functioning as a parent for me.
He sent friends in my life who led me to a youth meeting where I accepted Jesus Christ as my Savior.
Then, at 17, by His Spirit I was led day by day into reading, studying, and learning to apply scriptures. And in this He became more and more real and more and more dear to me.
He provided the means and ability to graduate from a Christian university and to serve for three years in the mission field. He taught me many things living in Christian community with other missionaries in a far off place.
He sent a wonderful man my way to whom I have been married though good days and difficult days for almost 50 years.
He gave me four children, took one, and left me three to nurture and see grow into adulthood some with children of their own.
He sent me to women all over a huge state..and guided me to lead seminars, retreats, and bible studies.
He made me a teacher, counselor, and administrator.
He gave me rest and retirement as well as grandchildren to love.
He then gave me a computer.
Here I am due to the love and grace of God.
Oh, and when I was sick with cancer and had to go though chemotherapy twenty years ago God let me sense His Love more than in all the times I was actively serving. He healed me.
Whenever I fell, or missed the mark, or made big mistakes, failed, or forgot..he forgave me and reset my feet upon a Rock.
He has loved me no matter what.
He is mighty, friend, healer, and the great love of my life.
How does He love me..I cannot really begin to count the ways even though I tried to do that here. That's why I love Him back. :)