My wife disappeared 14 years ago, can I remarry?

Dear Harold,

My wife of eight years left for work on a Monday morning 14 years ago and has never returned home. We have spent colossal amounts of money tracing her whereabouts including hiring private investigators, placing media advertisements and conducting mortuary searches. We made reports to police stations and the criminal investigations department when she disappeared but never bore fruits. I now want to move on with life and marry another wife since I have been lonely for too long. However, I am confused as we were married in church and have a valid marriage certificate. What should I do?