Kierkegaard - Works of Love Part 2 Chapter 6

Love Abides.

If love endures, then it is equally certain that it exists in the future. Set this consolation against all terrors of the future - love abides.

Love is eternal - to fall out of love is impossible for the true lover.  

Just as silence is a normal part of a conversation, a break can and is a normal part of love.  The conversation can be picked up again at any point in the future.

Spiritual love contains in itself the spring which flows unto eternal life. One can not be eternally faithful to that which is not eternal. 

Ont the other hand there is no hate that ultimately will not have to give up.