Did this situation arise due to prior karmic trauma history alone causing vulnerability, or was there active targeting by extraterrestrials affecting one or both parties to have a major spirit meddler attack with undermining of their relationship?

There was no extraterrestrial involvement here, this was strictly spirit meddler influenced and controlled interference in their personal lives. They were using a very frequent and time-honored strategy to cause a rift between the parties and undermine their love relationship. The spirit meddlers have been doing this for many thousands of years and are quite adept in manipulations of this kind. So this was a very common type of manipulation comparable to what is behind the 76% of divorces that are attributable to spirit meddler manipulation undermining human love relationships.