Eugene, thank you for not judging and for not reading-into my post and seeing it as flame-bait.
I do enjoy my monogamous-ness. But with a possible side of fun - if allowed - naturally.
As far as he and I are concerned. I am certain that either of us would be fully-happy being the only person in her life. And while my acceptance of him at times border on tolerance, his acceptance of me most times borders on a strong platonic love. (Meaning in short that he has more feelings for me than I do for him, although I see him as a true friend.)
But he has no desire to break up our marriage. And he would be more than happy (I believe) to simply be a participating member in a happy triad. While I struggle much more with this concept.
Hopefully this clarifies some things.
Sorry to hear about your hiking buddy.