nab- you must be honest with yourself- and he too.
If you really want to be with this other man, and he with you, it will not be the end of the world for you DH or your kids- or his DW- these things happen.
I am not encouraging you to leave -please note- or start an affair- but if this has really shaken you up, then you need to be honest, with yourself, your DH and your OM.
As Ihave said all along, it is possible tolove 2 people- but you can live only with one. If that is to be your DH then you have to bury this in the past and leave it.
Maybe it would help to try to focus on what he seems to offer you that your DH doesn't-as thre is a danger you are in love with a fantasy figure rather than the man himself.
You cannot share this with your DH- it would be too selfish- if you are pining and grieving, at least do it alone- you cannot inflict thison your DH unless you mean to end your marriage- you have to work it out alone. I am talking as one who has been through this!
Life is short- listen to your heart- it seems you are pulled in two by your head and your heart.
Iknow thismight not be the right question BUT- if you had to choose to spend the rest of your life with only one of them, whowould it be? Forget the fall out from divorce- just who would it be? Go with your first gut reaction- that's your answer.
If it is the OM then I think you need to consider if you want to stay in your marriage, irrepective of whether the OM is willing to leave his.
I do not want to sound harsh- but I have compromised when I should have had the guts to follow my heart and it is not a nice place to be in.