What does the Bible say about angels marrying?

There are no mistaken marriages among the angels.

Now the spiritual world is not as large and extensive as many suppose, for spirits are very soon made angels and as you already know, an angel is one that has become united to its other self, and after it has become united to that other self, it can no more be separated.

It is one angel. 

It has answered the end and aim of being cleft in twain, which is merely an earthly condition, for the purpose of propagation, and as there is no propagation here, there is no necessity for it to remain in halves any longer and it speedily becomes one, for love and wisdom must be joined that truth may be come apparent.

The Discovered Country