I think I may have a different take on this. There's a certain hopelessness that comes from seeing things we want to believe should be true proven to be false or by degrees, far more rare than we think they are. When I first read the OP I ran down a mental list of how most of the responders would take this situation and pretty much this has been the script. It's the BF, Wife's, Husband's fault. It's the way society has become's fault. It's the crowd STR8UP keep's fault. It's the "can't find a 'Quality Woman' fault, etc. etc. But STR8 isn't looking for answers - he already knows them. It's not a solution he's looking for, or the root causes, or the things he should do to avoid a similar predicament; it's about dread, it's about confronting nihilism.
I know, because I do it daily. It's like watching a slasher movie. You know the killer is in the house, you know he's going to slit the poor victim's throat. The power's out. She enters the house. You think, "no, no, just leave, get out of there, can't you see he's behind the door?!" And, true to script, she keeps going, the killer surprises her, and slashes her throat. It's scary the first few times, but after the 10th, 20th, 30th time? It's predictable. It's boring. Oh, you know you'll never be the hapless victim of course, but your best friend? He hasn't seen the movie yet. The guy in the cubicle next to you, arguing with his fianceé? It's a brand feature film for him.
I know a particular AFC who's is deep in the bowels of the Matrix. The guy revells in his AFCness. He'll never understand what STR8 or myself or the better portion of SS members know is happening to him. The guy was abandoned by his ex for every reason an AFC is dumped. She moved on, is in a great, healthy relationship with a DJ who knows how to take care of business. He's not a player, but he is a Man and she can't stop thinking about him. The AFC, in spite of all this, and over a year and a half later, he still tries to rekindle what he had. He is completely oblivious to the circumstances she's in and he himself is in. And the only one who can appreciate the full scope of what he's going through, the only one with a birds-eye view of their conditions? That'd be me.
That may sound conceited, shallow or presumptuous, but he's not the first guy, and she's not the first girl I've seen do EXACTLY THE SAME THING. It's to the point where it's boring, it's predictable, it's typical. And with that comes the veritable certainty that anything I could say, from the most honest part of my being to help him or any AFC will be by-passed with a disregard that can only come from an ego-invested chump or a self-absorbed girl.
STR8UP, I think you're experiencing what I call the "why do I bother?" blues. I do this all the time and particularly here at SS. I was in one of my moods when I started the "What you're up against" thread a while back. The surest way to experience this abject hopelessness is to go over to Love Shack.org. A lot of people PM me asking about the book I've written, and I am in the process of shopping it now, but I've delayed it more than once due excatly to this nihilism. I think "what's the point, no one will receive it." Oh, people will pat me on the back and say "right on man, I've always thought this stuff but you put it into words", but I know damn well they'd go right back to living in the Matrix.
It's nihilism. It's not the situation itself, it's the powerlessness of having to be a passive observer of the whole thing knowing that neither party would ever fully appreciate your effort to help them.