Love is constant and steady, no matter what circumstances occur, whether likeness or common ground is lost, or how much the people in love change.

Love is infinite, eternal, unbreakable and unconditional.

All comes back to love and love can not be absent from anything...even if it looks that way. 

Shakespeare's infamous Sonnet 116 reminds us.

Let me not to the marriage of true minds

Admit impediments. Love is not love

Which alters when it alteration finds,

Or bends with the remover to remove.

O no! it is an ever-fixed mark

That looks on tempests and is never shaken;

It is the star to every wand'ring bark,

Whose worth's unknown, although his height be taken.

Love's not Time's fool, though rosy lips and cheeks

Within his bending sickle's compass come;

Love alters not with his brief hours and weeks,

But bears it out even to the edge of doom.

If this be error and upon me prov'd,

I never writ, nor no man ever lov'd.