I opt for one of the 2 following:
1. he has met untimely demise similar to another recent very sad post about a missing person, we hope not the case.
2. Hes leaving the OP and is a spineless loser afraid to even call her and tell her, "Listen, I've fallen in love with Maria, I know shes 25 years my junior but really it like I'm 25 years younger, we're in Love, really" so I'm leaving you.
g'luck
otherwise probably best bet is if you know somebody here to hire a PI with a locals help, to hopefully learn the truth spelled out in #2
Or,
1. Got struck by a coco nut.
2. He forgot how to speak spanish or english.