As someone who was devastated by this action (OK now, but with a new reality)
"the choice not to test your lover's commitment to you, in case that 'love' turns out to be the mirage it often is."
made me chuckle. But not in a horrible way, because you OWs are ALSO being screwed, and in that you have my recognition and sympathy.
You are NOT in a relationship
You are in a fantasy
You are a symbol - of freedom, no demands, the perfect woman
You are NOT loved for you, which is what you long for
You are filling a hole in the marriage, yes
But that hole comes out of HIS character defaults
Because he is unable/unwilling to fill the hole it is easier to turn to you.
His wife is unable to do this hole filling on her own, I promise you.
I wish you all care, I really do. You are in for a lot of pain, only you are blinding yourself to it. Take great care.
[And if any of you are in a great passion with the man I married? If you can get him out of my house, you can have him. He just will not go!]