So for the past 5 yrs you've been open ....and the past year and half he's been with her .....what changed in your life that this became an issue .....why now? Has their been a change in your other relationship(s). Has this effected your other relatioships?
If you get your way does that mean you will dump all your outside relationships and go back to being mono.
Ps...if you got the time take a look at my other questions