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eroock
Since: Sep, 2012

I was looking for a trope related to ghosting, i.e. the practice of ending all contact with a person without former announcement, and the strict decline of any attempt to re-establish contact.
A more generic one, where a partner did not officially renounce the relationship, but is still nowhere to be found (and it's implied that they left on their own terms) would suffice too I suppose.
The closest resemblances I found were Runaway Bride and Disappeared Dad, but they only work in rather niche settings (just before marriage; as soon as the couple have already conceived children).
Examples I can think of from the top of my head:
Thank you all in anticipation!