nishamani, we all understand perfectly what you are going through.. and have to admit, it's not easy...
but since "he never even had any respect...", why do you need this man even?? we don't know where he conducted his so-called marriage.. it doesn't matter.. does it matter whether he has a paper of marriage or not? he has betrayed you anyway, with paper or without..why do you need a traitor??

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"What lies behind us and what lies before us are small compared to what lies within us."
Oliver Wendell Holmes