His love is both unconditional and irrevocable. And it's not based in any way whatsoever on what I do. God loves because God is love. My relationship with God is conditional. While His love is unconditional, my relationship with God is two-way.
Love can be unilateral.
A relationship, however, is bilateral. I love her unconditionally and irrevocably, yet a true relationship is two-way. Yes, I could love her, if my love were unconditional. That's another question. Love can go one way, but a relationship is two-way.