"I want to love you until the final relief of sweet merciful death"

It is certainly dramatic. It has a very Abrahamic vibe by the implication that life is something to be released from and that the afterlife is the end goal.

That’s beautiful for a wedding vow …

True love is not something from which one wants to be released.

No, I am sorry. That just seems morbid.

It wouldn't float my boat...