Why do relationships or marriages fall apart?

A Separate self cannot love. It is not even aware, let alone perform the function that only infinite ever-lasting love can perform. Relationships and marriages are based around the idea ‘I will love you forever’, yet the very self that says this is temporary and, even worse, illusory. One body/mind cannot love another body mind, because both of them are objects. This is like saying a bench can be in love with a sofa. 

Consciousness sees only itself. As such, it loves only itself. It is love, it is who you are. It is your nature to love eternally. Actually, it is impossible for you to not love eternally. Anytime you say ‘I love you’, and you genuinely mean and feel it, you are in touch with your True Self. 

Unless you know your Self as Consciousness, you are only pretending to love.