Now, this is just a BIG tin foil hat theory, so bare with my Maple Flavored Insanity (TM)
I am ready to get massive down voted for this, but I read a document the other day that Bill has been doing the vaccine thing for years, mainly in underdeveloped countries. I want to go out on a limb, and say that Melinda is a long time plant for some kind of undercover sting against this guy. They separated becasue the investigation finally had enough, and got what they want, or Bill and the cabal found out and had her 86'ed.
I have no evidence to back this up, as it's just a stray thought and a massive leap in logic, but if anyone wants to jump in and theorize (or call me a bundle of stick), feel free.
Ah, I see.