Good question! I am like a lock box of secrets, it's fun for me to keep them, like a game

I'm an INTJ... I keep secrets fine... except in very rare occasions where larger issues are at play.

For the most part, yes....but in a situation where I think it might be better for a secret to come out, I have a moral dilemma. I'd probably tell if it was a matter of someone being hurt....or persuade the secret-teller to tell someone else if it was a matter of their own personal pain. >.> I've caught myself offering advice based on a secret without actually divulging it....like if someone told me in confidence that they were beginning to think that their bf was getting too smothering or something. I'd make it out as if I noticed personally that he was being really clingy and playfully tease. It's part of my innate need to want to fix things if I can.

I can't. I have to tell someone something. Usually a friend on the other side of the planet.

But I have gotten 10000% better over the last several years

Yup, absolutely. If you tell me it's a secret, it will stay a secret. Because of how extremely private I am, I know how i'd react if something I had revealed became public knowledge so I'd never do it to someone else.
Like Alysaria, exception being if someone reveals something to me that makes them a danger to themself or others e.g. If someone said "don't tell anyone, but I'm going to murder my brother tomorrow", or if there's a moral dilemma that needs to be aired for the greater good no matter how uncomfortable.

"Don't tell anyone, but I'm going to murder my brother tomorrow"

That would fall under my, 'the person sharing it with me will be hurt by my sharing the secret' constraint.
I'd have to stop him myself.

What if you couldn't stop them? Are you saying a person's feelings getting hurt is worse than death? A violation of trust is worse than death? A life is less important than the violation of your principles?

In comparison, if your friend revealed their brother was going to commit suicide tomorrow, is that a secret you would break? (still ends in death, this time assuming the secret-sharer isn't hurt if you don't keep the secret).

Playing hypotheticals here, clearly. Just interested.

Well its an act of trust. I can't betray trust in any significant fashion of my own choice.
A court could command me to divulge a secret and I would.

As for a life... a life could be less important than my principles. Not always. Like lets say I was a spy with government secrets and a friend of mine was threatened to get me to betray those secrets. I wouldn't choose to betray those secrets, despite the fact that it would hurt me and hurt my friend.

With the imminent murderer, if I stopped him from committing the murder, I would be protecting him - not hurting him. It is possible I could get help, but it sounds iffy. Most likely I'd do my best to stop him myself.
Him telling me his brother is committing suicide... that sounds like being asked for help. If I couldn't stop the suicide myself, I'd try to convince him to reveal the info to someone else. If he decided to be extremely stubborn, and I had no way to convince him to reveal the info to someone else... it would be kinda ugly. A lot of it has to do with underlying motives. Lets say he's telling me to keep a secret only so he can be amused by it. I wouldn't consider that a valid secret. A secret is a making of themselves more vulnerable in a show of trust.

I don't break promises... if I had promised to keep the secret of the guy's brother's suicide, and his motives were questionable, and I couldn't stop the suicide... *starts considering the exact wording of his promise, to find loop holes...*
Basically, I would believe that the guy needed to be punished, but the promise would most likely be held. If I couldn't find a workaround that allowed him to find justice legally. My first impression is that I would find a way to bring suffering on him, myself. But I have the impression that I wouldn't reveal the actual info about the suicide to someone else, except in the kind of limited sense that Alysaria mentioned... imply to his loved ones, or others who can interfere that there may be some cause for worry, without disclosing what exactly it is. If what I can do is not enough to save him, then that's how it is.

Its kinda like asking me if I believe the life of an individual has more importance than the process of (properly designed and practiced) law. No, not really.
That would be the same as, lets say, bowing to terrorist demands to save hostages and thus causing the proliferation of the idea of taking hostages to have unreasonable demands met.
I believe people must uphold their promises. There must be trust among people and in society. And criminals must typically be brought to justice without breaking other laws.

I agree -- I'm pretty private about the big things, and -- I guess I see whether I keep something told in confidence as a sign of whether a person can trust me. They can. Plus, I see it as their business, why should other people find out? So I'm a lock-box for secrets. We all seem pretty uniform on that.

ENFPs live for the moment? I read that they are polar opposites from artisans because they DON'T live for the moment, which is what I related to. I see a lot of ENFPs are this... ENFPs are that... quite confusing. Doesn't quite jive. From keirsay.com:

Artisans may be the most opposite of the other temperaments to Idealists. While you are abstract in your communication and cooperative in your actions, Artisans live in the here and now, and are more concerned with results than following rules or smoothing peoples' feelings.

ESFPs live in the moment.
ENFPs live in possibilities, which aren't really time. O.O Which is why time has little to no meaning to ENFPs. >.> Money really doesn't either, except as a tool to maintain freedom and possibilities.

My ENFP best friends keeps secerts about as well as the Rosenbergs.
On the other hand, I keep secrets as well as a dead pirate.