Let Us Not Just ADMIT, But Let Us Send Out Engraved Invitations to the Impediments to the Marriage of True Minds When Those Impediments Come A-Knockin'

I've already gone off on a German cardinal's statement at the so-called "Shadow Synod," in acceptance of serial monogamy, yeah, I used to love you but you know how it is, let's be adult about this.
This phrase, however, was contained in another theologian's intervention, a theologian the aforementioned cardinal quotes extensively and approvingly -

the indissolubility of marriage is not a prescriptive aspect which is brought from outside; it is rather a request that spouses make to themselves, when they trust in their love.

"To themselves"?
No, to each other, surely!
But allowances must be made for translation, perhaps that is the sense of what Schockenhoff.

But another objection I have is that a it's hell of a lot more than a "request." It is a pledge, it is a promise, it is a covenant.

The request is made, and the response to the request is contained in courtship and proposal.

A Christian marriage is saying that the two have moved beyond the stage of request into donation and reception.

Is my understanding of the sacrament a cousin of the confused theology of eternal security, of "Once Saved, Always Saved"?
Am I proposing "Once Loved, Always Loved" and "Once Loving Always Loving"?

I think I am. The way his coreligionists might describe a flagrantly, publicly sinning televangelist, (well, he must not have been REALLY saved...) I look at anyone to whom the phrase, "fall out of love," is applied as never having "really" loved.
The Sacrament of Matrimony is a sacrament, a reflection of and a sharing in God's marriage to, and love for, His bride precisely because it IS an ever-fixed mark, it DOES look on tempests wihtout being shaken, it is NOT Time's fool.