After having read the thread now I have a little more insight, but my gut instinct was basically confirmed with every post. You are not a sociopath at all, but a broken girl, quite sensitive, and reeling from a tragedy. If you were a sociopath you wouldn't feel guilty about not feeling guilty and feel the need to explain the situation to bluelight for the mere exercise. If you were a sociopath your whole life would most likely look different from how it is right now... probably never getting married in the first place, unless it was to some decrepit old billionaire, in which case his death would hardly have raised a blip on the radar screen of your emotions (except for excitement about the inheritance, inevitably).
If you know you're being a cliche, then surely you know where this cliche is heading, right? Then surely you know why it'd behoove lots of people if you stopped thinking with your hormones, and made your Alma mater proud for issuing you their psychology degree? And, of course, you know why this married man is a classic cliche of a scumbag, and your tragedies are perfect bait scumbags use to manipulate their prey into doing exactly as they wish, exactly on their terms? I'm sure he's a great talker...what's his job, by the way, a salesman? An insurance salesman perhaps? Maybe a lawyer? I'm genuinely curious about how he earns his living...for the cliche's sake, mind you.
You say that you feel guilty about him having 3 kids like it's a reason to be proud of yourself....like it's a reason to not feel guilty about the rest of the messed up things you're doing, but have you actually analyzed why a person would feel guilty for basically getting in the way of a husband and wife and their children? You are directly helping to ruin 3 futures of 3 individuals who are totally innocent as of right now. Does that aspect of wrongness turn you on too?
I sure hope his conversation is good... Do you ever talk about how there's at least 3 people who think the world of the man that is currently spending much of his time chasing someone else's tail? Do you ever talk about how predictable and cliche the kid's responses are going to be once he and his wife break-up? Oh man...kids...can't help but be a cliche sometimes, though, right? Are you really so naive to think that you understand him better than his wife does? What makes you think that? I bet you talk about all the cliched things that people talk about, sex, religion, drugs, politics, pop-culture....is any of that so rare?
I really don't think you're a sociopath, and I think you're using the tragedy in your love life that you recently weathered as something of a rationale for hurting this family, for wrecking a home. It's typical for girls to throw caution to the wind once something bad has happened to them, and they can't help it if a guy hits on them, right? I think the event of your husband's death is key to this whole thing here, somehow some way. I also think that it's a load of bullshit to say "I don't think I can ever love again" as another sort of half-justification for this whole mess. You're basically saying everything BUT "I love this married guy!"
Ahh...man...I can't pin point exactly what I want to say about this...but it'd really be better for everyone if you just told him that you can't talk to him any more, under no circumstances, and then moved on from him completely. You're not going to, though, aren't you? You're going to let the situation ferment a little more, get all the hollow pleasure from him until it can't go on any longer, then feel devastated, then hate men and never give an actual good guy another chance, then get a bunch of cats, then get funny little decorations....cliches...gotta love 'em...except that last one I think was just my one aunt...
You're skating on thing ice here, girl, and you're telling everyone how well your ability is to read the signs even as you blatantly ignore them. "This will all end in tears." I forget who said that..."Pretty girls make graves" I think Jack Kerouac said that...
Do you think that the tragedy has made you callous to other people's pain? Or to pain in general? I can almost guarantee that it hasn't, but it is giving you a reason to convert back to your addict mindset. You definitely would benefit from a good few close friends, or a good therapist, or many other things. You will never ever benefit, in any way, from this situation though. Good luck...