Dear Richard,
By the sounds of it, if what you say is accurate, then most likely it would be grounds for an annulment but it would still be a tragedy, most of all for the children.
Marriage, whether sacramentally valid or not, is a commitment for the sake of a stable loving family, and any rupture to that structure is devastating to children.
Get some marital therapy and think twice before acting.
Peace,
Bob Kirby
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