Why keep her around in a miserable relationship? I'm guessing that most of us know at least 5 couples we could ask the same of. Publicly, we could ask why Sherri Coleman stayed with Chris, Michelle Young with Jason, Nancy Cooper with Brad, Rachel Entwistle with Neil, Laci Peterson with Scott, Janet Abaroa with Raven, Logan McQuery with Elizabeth, Billie Dunn with Shawn, Darin Routier with Darlie, my stepdaughter with her husband, and me with my narcissistic sociopathic husband for 20 years.
All but the last two ended in death to innocent lives because they thought they could figure out how to make it work, make better people of their seriously flawed partners, felt somewhat responsible for having gotten into their situations, and saw just enough positive in the person to want things to work out.
I finally realized I could not FIX the relationship OR the sociopathy and escaped with my life and psyche intact, but many people end up dying before they realize this. I fear this for my stepdaughter, who has already been threatened and whose husband will not take his meds.
It is also common to try to convince oneself that the other person isn't as bad as all that, would never harm, or isn't "really" lying.
Such MIGHT have been the case with Robyn's bf. He may have only accepted how flawed she really was upon finding out on the national news that she was in Aruba with a man she had been seeing regularly for several years. Knowing what I know now from twenty years of my life wasted with a sociopathic bum, if it was me, I would write her off at that point, whether she was dead, alive, or missing. It's just NOT HIS PROBLEM!
And if he made some cash doing media spots to recoup money he may now think he was foolishly conned out of by her these last few years, more power to him. I hope it helps him become a healthier, less vulnerable victim in the future (although I would have preferred he just walk quietly away into the sunset).