Just because this other guy seems perfect online....doesn't mean that things will go well when you meet. You know the saying "The grass is always greener on the other side?" Well honestly I think your just relying on something else to make you feel less lonely and think that being with this guy(that you have never met) will change everything for the better....
But you must keep in mind this....
There must have been something about your husband you loved at one time.... Couples go thru this....they fall in and out of love.....but its up to the both of you to communicate your feelings and to let each other know whats up.....and then together you can work on things so that you can get that flame going again.....
Seriously talk to him. Tell him that your not happy with his crazy work hours and not seeing each other etc. Tell him that you cannot go on like this anymore....and that you are seriously considering a divorce. Tell him about how you feel there is such a distance between you and that if things don't change....your gonna have to do something about it.

If he loves you he will take this to heart and realize that things aren't going well with the two of you and hopefully reconsider his job...and what its gonna cost him in the long run(his wife).

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Appreciate the good times and learn from the bad times....