grow apart

absence makes the heart grow fonder

One feels more love or affection for those one loves when parted from them.

come apart at the seams

Synonym of fall apart.

drift apart

To lose contact, to lose one's friendship or closeness.

fall apart

To be emotionally in crisis.

grow a pair

To be brave; to show some courage, especially in a situation in which one has so far failed to do so.

grow a set

Synonym of grow a pair.

grow a tail

to be nearly about to defecate, to the point of being unable to completely hold it in

grow cold

To wane; to lose interest or enthusiasm for something or someone; to become disenchanted or to fall out of love with someone.