Talking of love being an addiction, you might find the following interesting
Hiya Saff! Thanks for the link; I'll give it a read.
Perhaps the most fascinating thing I ever read about this topic was that they can now actually SEE the chemical addition -- it shows up on CAT scans! They took a PEA-washed brain, newly in love/lust/infatuation, and compared it to one that wasn't. They were remarkably different!
To my mind, it (the basic premise that affairs are ADDICTIONS) is the only thing that ever made sense to me. It was like a light bulb went off for me. It was the only thing that would explain well-respected pastors, throwing away their relationship with God and their congregations; successful businesspeople, throwing away their careers; up-until-then-happily-married couples, throwing away their marriages and even their own families . . . the destructive behavior (bank accounts drained, small children left unattended by previously "great mothers," etc., etc.).
It's the only thing that makes sense.
And once you approach it from that premise -- affairs are addictions, and you first must separate the addict from the source of their addiction -- to me, at least, everything else is common sense and falls into line.