in my case, it is not. my husband is of the mindset that if i don't want to be with him and i don't communicate, i don't care about him or i'm retaliating. maybe each sitch is unique. i tried LRT but it's too close to my behavior that drove him away. so it's not a 180 for me and that's what he needs from me.
hope my opinion helps.
In your case. I think I would communicate to him that there is nothing you can do to stop him from being with OW. And that you will not communicate with him about the relationship while there is someone else invested. And move on. If he wants to talk he will.
Flowers always make people better, happier, and more helpful; they are sunshine, food and medicine for the soul. unconditional love is awesome!