You’re using the word soul in the wrong context, so it is a tad confusing.
And St. Epedite is a he, not a she.
Expedite is only for urgent matters, and there is absolutely no urgency in wanting to break up someone’s relationship. It does not qualify as an emergency, and is not a need, so St. Expedite will not help.
If you want to speed up a magical manifestation, then invoke Dynamis: