B/c you allow him to be with her. There are no consequences -not for the affair, not for his disassociation and disregard for you and his family, for his poor judgement and his disrespectful treatment of not one but 2 women. Neither one of you women will expect a thing of him. You both are willing to take his cake crumbs.
And until that changes - he won't. He's totally thinking with his little head and y'all just let him get away with it.
So probably the one that puts the pressure on him FIRST will win. Either she will say "Hey, I'm free - now you get free so we can seal this deal." OR you say "Hey, I'm not going to accept an open marriage a minute longer. I'm filing and you're moving out."
Greek
Me45 H46 T25 M22 S21 & 19 D13 Separated and filed 8/08 Moved home 11/08