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.
My love might live on, but my marriage relationship would be dead. Relationships are not unilateral. But Christians have great security. A two-way relationship does not mean that Christians have little security. On the contrary, the security of a believer is exceptionally high almost absolute.