My husband seems to be missing

Itís been a month already since I received my husbandís last text message to us. He is an architect and is currently working in Chongqing, China. My children have been so curious as to why their dad is not communicating with us anymore. I canít answer them coz I donít have any idea whatís happening. I tried to talk to his co-worker, but no response at all. I am starting to get worried. Is he missing? Is he cheating on us? Knowing that a number of Chongqing women are present in his workplace in China. What should I do? Need help!