"cannot be apart" is correct and can be used in written English.
It is used to express that two or more people or things cannot exist separately or must always remain connected. For example, "Our love for each other is so strong that we cannot be apart."
For example, Dōgen speaks of it as "being-time" (u-ji) to indicate their inseparability; being cannot be apart from time, and time cannot be apart from being, where a being spatializes through the process of temporalization, and where it temporalizes through the process of spatialization.
"We are in love and cannot be apart from each other.
The Son has the same power and will as The Father and The Holy Spirit: that is why they are one God, and the three of them cannot be apart in anyway, they complete each other in everything.
For example, the so-called helicopter parent is one who cannot abide to be apart from the child but hovers over his or her every action, to "be there" and to "ensure safety".
For domesticated species, the good life, if we can call it that, cannot be achieved apart from humans -- apart from our farms and, therefore, our meat eating.
Jerusalem is ours, not theirs, and it cannot be taken apart.
But military objectives cannot be seen apart from the political goal.
We Greeks are identified with our history and culture which cannot be torn apart, loaned and ceded".
rules state that the course's start and finish points cannot be farther apart than 50 percent of the race distance.
But it is a politics that cannot be understood apart from the history of the debate: a debate that has never been about reality.
Other required qualities are clear communication, coolness under fire and a personality solid as granite that cannot be sliced apart by the media.
