Nothing very mysterious about this, sadly, but on GL around 2000 and 2001 there was a token triangle between Vicky Spaulding, David Grant, and Ruth, a woman Reva had helped turn around after dire financial straits for herself and her son had led her to hold someone hostage (this also started Reva's TV talk show career). If memory serves, they all just vanished.
On AMC, Vicky Platt (Victoria) had the same problem in 1996. She, along with some dubious material about voodoo, was introduced during the splashy Jamaica remote for Noah/Julia/Hayley/Mateo. She returned with them to Pine Valley. I think they teased a relationship with Jack, who was still in a 3-4 year backburner period at this point. Nothing happened. I can't even remember if she got an exit.
That became an extremely irritating constant at AMC over the next 5 years, as any number of characters (Kevin Sheffield, Becca, Tina) simply disappeared, never to be mentioned again. Soapcentral archivists would add "After the stresses of ______/end of relationship with _____, _____ quietly left town," over and over again.