you don't have to apologize for calling the OM. Just leave him/them alone and say nothing more.
I thought it was a one time call you made. Were there others? What's the exact claim of the L?
You were warned that the world does NOT see their A the way you do. But if it was a one time thing, I'd say just drop it. I don't know what their cause of action is, the "intentional inflction of emotional distress"? And their behavior? Oh blah blah blah= MESS...
Yours is a cautionary tale on this issue for sure. If his L wants something from you, or is warning you to stay away, you can say "i've said my piece to the married man who slept with my wife and for that, I won't apologize. But I'm done."
And make it clear that you made NO threat of any kind...right?
M: 57 H: 60 M: 35 yrs S30,D28,D19 H off to Alaska 2006 Recon 7/07- 8/08 *2016* X = "ALASKA 2.0" GROUND HOG DAY I File D 10/16 OW DIV 2/26/2018 X marries OW 5/2016