Dear mtsgrad
I've just gone through exactly the same thing this year. Had been married 12yrs. I followed my heart and had the affair. I was very much in love and couldn't stop it. Personally, I've never regretted it one sec. It was an amazing experience for me after being so miserable for many years. Of course, I'd never done it if I was still happy in marriage and under WTs strong influence but luckily I'm out now and free and happy!
I say, go for it! Follow your feelings and what feels right for you.
Good luck and let us know how things turn out for you.
/Newborn