It is a relationship, and it is the most important relationship that we have.
It's not a matter of God fulfilling His part, but it is a matter of us giving ourselves to Him each day. We have to allow Him to have His way in our lives and to let Him be God to us.
It's such a help when we realize that His love for us is not based on anything that we've done to earn it, because we haven't. When we receive His love and love Him back with all our heart, mind, and soul and love others as much as He does, we show The Lord that we love Him.
We will know that we got it right when we hear Him say "well done", one day, very soon!
We are truly blessed, because we are living for God!