I actually get the part about being bored and empty, but in my case, it was because my H had gone MLC without telling me. Even while I was moving forward with my life (even though I didn't know it was MLC, I still went out and lived my own life), having someone there who wasn't there left me with a hole in my life, so I could go with empty. The bored would come when he had said we'd do something and silly me waiting, then he decided he didn't want to do that after all. (PO'd came with that, too, but that's another story)
So then I have to think about the men who put their all into work, because bringing home the paycheck is important to them, sometimes more so than spending time with their families. In these men's minds, they ARE loving their families, by making sure they are provided for, but they are loving them THEIR way. Their son would rather have dad home for his game than off making money. Their wife would rather have more time in the evenings than that skiing trip to Vermont the extra time at work brings. Those families may or may not be bored, but they might feel empty without their father/husband. Or the people with hobbies that take up all of their spare time. If they don't want to make time for their spouse, what's the point? Those are the wives who just walk away due to feeling left alone, I think. (same with H's, but we're talking women, here)
But there are certainly plenty of people who are just empty inside. They were controlled as children and have no idea who they are. They were sent on a path they thought was right, but wasn't necessarily them. They keep up with the Jones, and need all the latest toys because everyone has them. They have to stay in the herd so they can "belong" somewhere. They don't know their own minds, or have their own esteem. They are bored because unless someone else is telling them what to do, they don't have enough of their own personality established to know what they want to do on their own. These are the candidates for MLC, in my mind.
The difference, to me, is how covert the beginning was, and how FAST everything came after BD. My H said "He tried everything." Yep. He tried everything once, in rapid succession, with nothing but accolades from me for all his efforts RIGHT BEFORE BD, yet he still said I thought he wasn't good enough (I wonder how long he has been me and knows my thoughts? If he had, he'd have picked up his socks for 20 years...). There's the difference. The weirdness that goes with the withdrawal. Normal people don't do that.