I'm really on the fence about whether she took off or if GR is at fault here (trying to stay within the rules, but you know what I mean about GR). All these points about GR that you guys have gone over are very valid, and do cause a great deal of suspicion. Maybe the cops are watching him and waiting for him to slip up? It's very odd that he'd "give up hope" so quickly after her going missing. Very VERY odd. He's definitely said some strange things that make you go hmmm.
At the same time, we've seen people run off before (even mothers). That lady who was on Dr. Phil - Tiffany Tehan. She was a mother who ran off with her lover and stayed gone for awhile. And there are many others who go missing of their own accord. I'm a big ID Channel addict, and love the show Disappeared. I've seen several cases where people have ditched their cars and cell phones and seemingly disappeared off the face of the earth. There was one guy, Tim Carney, who did this - ditched his car and wasn't heard from for 7 YEARS - then turned up alive and well, although no details were given about why he left or how he managed to remain undetected, or what his new life was like. So, it does happen.
And if the marriage was pretty much "done", maybe GR didn't love her anymore (which unfortunately happens all the time in marriages, right?). Maybe he fully believes she took off, and doesn't believe she's in danger. At the same time knowing that he is under suspicion, since he's the husband. Maybe that would account for the weird behavior on his part.
I can see either being the case!! But I think it's one of the two, b/c if anyone thought she'd met up with some online person and then met with foul play, they'd be looking harder, KWIM? I'm at an even 50/50 on what could have happened.
JMO