Originally Posted by
Gemini54
I think swinging in a relationship is precarious - as you're finding - and it takes an unusual and committed couple to withstand the challenges. In my experience, from people I know, it's not uncommon for people to fall in love or become infatuated with their swinging partners and for this to destabilize (or end) their marriages.
Although this revelation puts your original question in a slightly different light, I think that much of the advice provided by the posters still applies.
You and your husband need to 'swing' the focus back to yourselves and commit to each other again, not to erotic external fantasies. If he has been complicit in getting you to do this, then you must speak to him and tell him you don't want to do it again. The swinging and the contact with his best friend needs to stop as, at this point, neither of you has the maturity or self understanding to relate simply as friends.
Remember that commitment, trust, constancy and companionship are what build a good relationship - experimenting with passion, sexual arousal and excitement outside of your marriage can only, in the long run, lead to uncertainty and tears.