Reports of missing persons have increased sixfold in the past 25 years, from roughly 150,000 in 1980 to about 900,000 this year. The increase was driven in part by the country's growing population. But the numbers also indicate that law enforcement treats the cases more seriously now, including those of marginalized citizens.
http://www.crimelibrary.com/criminal_mind/forensics/americas_missing/2.html
The husband may not be guilty of anything. The woman may be the victim of a lunatic. No telling at this point.
If he is not guilty of anything he would be losing weight, trying to do anything and everything he could to find her, not sleeping, telling the kids he was trying to find her, demanding the cops find her, tracing and retracing her last steps.