I know where your coming from and I sympathize to a point, but I also feel bad for your H. If you didn't have that attraction for him from the beginning, you never should have married him.
You have a right to be happy, but must be sensitive to the one who will be hurt by YOUR mistake. Make sure you don't repeat this mistake with another future partner.
Usually, what goes around, comes around. Life is funny that way and lessons are sometimes learned the hard way. From a LBS perspective it's a very painful situation to find yourself in. This isn't going to be easy for either of you and the happiness you perceive with OM may elude you in the end. Be very careful how you handle this.
"It is curious that physical courage should be so common in the world and moral courage so rare." -Mark Twain