Nah, it isn't just him. Anyone with any kind of knowledge about social norms or personal boundaries understands that involving yourself was a terrible idea. You were wrong to involve yourself, as everyone has already tried to explain.
Most people understand that gossiping about, meddling, and stalking nearly complete strangers are activities which are frowned upon, even as early as elementary school. You've shown an unhealthy interest in the lives of these people you barely know. If you were to see a psychiatrist, as has already been recommended to you in this thread, they would explain that your compulsion to involve yourself in this and refusal to understand the personal boundaries of others is abnormal, as would most people with any sort of common sense, or life experience, or friends.
You made this thread asking for advice after having already done it, so the only thing it could have accomplished was to make you feel better about what you'd done. This shows you understand on some level that what you did was wrong, though you're not mature enough to be able to look at opposing opinions as credible or to look at yourself as possibly being wrong. The fact you would make a post saying "Who was right? Who was right? Damn straight; I was right." demonstrates this immature mentality.
It's not some kind of achievement that you were right. As has already been pointed out to you earlier in the thread, most relationships involve cheating at some point by one or both parties. You were more likely to be right than wrong. The question wasn't whether your information was accurate (which you had no way of knowing anyways), but whether or not your actions were right, which they weren't.
If it was still there, I'd look up the shoutbox conversation which went something like
Azrael -- It's obvious that you're going to tell Paul if you haven't already. Nothing anyone says or does will change your mind, you've already decided to tell Paul, and only made the thread hoping that people would agree with you so you'd feel better about it.
Cecil -- You don't know what I've done or what I'm going to do, don't act like you do. This scenario might not even be real, I might have just made it up.
Azrael -- It's clear by the way you disregard every person that tells you you're wrong. I will bet any amount of money that you will, at some point, go out of your way to inform Paul about your suspicions.
Cecil -- Well I like playing Devil's Advocate so no you don't know what I think or what I've done or what I'll do.
Azrael -- Yeah okay, your superior mental workings are clearly beyond the comprehension of mere mortals like me
Who was right? Who was right? Damn straight; I was right
A few previous comments to consider in improving yourself.
Quote from name:Azrael.Wrath
You don't know either person. You're barely an acquaintance to one, and not even that to the other. You're basically stalking them as it is, gathering information on them and watching her Facebook page and checking who she talks to and seeing what she says and making threads about the two of them. You've already crossed a boundary that makes what you're doing creepy at best. Now you're asking if you should stop just being a voyeur and physically involve yourself in their life.
The answer is no, you should not. You should take about five steps backwards and involve yourself even less.
That is the correct answer, based on all social norms and generally accepted etiquette. What you do is up to you.
Quote from name:Azrael.Wrath
What you are trying desperately to convince yourself is okay to do is, in fact, not okay to do. Most relationships involve cheating at some point in time, by one party or the other. Why is it you feel compelled to insert yourself into this particular man's life, and inform him of something you don't know is even true? Why would you go out of your way to cause insecurity or worse in a relationship where you don't know either party? What right do you have?
That's right, you have none. It doesn't concern you. It's none of your business.
I mean, do you really not understand what "your business" includes? You seem to have some serious issues with understanding boundaries and what is considered socially acceptable.
Quote from name:Azrael.Wrath
What you're ignoring is that it isn't your place to go confronting people over what you perceive to be a romantic slight against a stranger from another stranger. If it was your friend involved, then yeah, this conversation would be relevant. As it stands, you have no place whatsoever to involve yourself. You need to stop throwing your pseudo-moral tantrum and try to learn something called personal boundaries.
I suppose though, there's no use trying to reason with people like this. They could be stalking a woman and convince themselves they're doing something righteous because they're just making sure nothing happens to her. Then they would make some totally irrelevant social commentary about how they're bothered by the way we're conditioned to ignore one another, and then say they wish someone would look out for them the same way.
Quote from name:Azrael.Wrath
The only one with a problem in this scenario is you, and your compulsion to involve yourself needlessly with the rest of it.
My suggestion? You should read
this article. It's obvious you need to.
When I suggested that you get a life, I wasn't making a snide comment at your expense. It was legitimate advice.