[Raynor]

Originally Posted by radagastly

Yet, he seem to have an insight beyond that of the Eldar, or at least beyond that of the half-elven.

Arwen already made the choice to become mortal

Originally Posted by Many Partings, RotK

I shall not go with him now when he departs to the Havens; for mine is the choice of Luthien, and as she so have I chosen, both the sweet and the bitter.

This is made even more explicit in HoME XII:

Originally Posted by The Tale of Years of the Third Age,

At midsummer Arwen came with Elrond and Galadriel and her brethren, and she was wedded with Aragorn Elessar, and made the choice of Luthien.

We also know that this choice was irrevocable:

Originally Posted by Letter #153

The view is that the Half-elven have a power of (irrevocable) choice, which may be delayed but not permanently, which kin's fate they will share.

Originally Posted by radagastly

I'm curious about Tolkien's view of the inherent conflict between love of God and Romantic love.

In letter #43, Tolkien tells his son Michael about the dangers of love in modern times. He considers one of the weakness of the then still strong romantic tradition the idealisation of Love and Lady, above or ignoring God; the fault lies in the fact that both partners are fallen beings, and none deserve to be idealised as guiding stars. Instead of this false and make-believe approach, he argues for religious principles, and that "the real soul-mate is the one with you are actually married to", while pursuing divorces to give a chance to "what if" is only illusory (he actually calls divorce to be a "human abuse").