I only have a problem with jealousy if the woman seems like they wanna stray.
For example, I was just in a long-distance thing where we agreed to be exclusive (though we weren't really "dating"). One day she gets on FB and says that she saw the cutest guy at the store. That didn't bother me that much. I shrugged it off until I saw her comment about how the guy didn't notice her. Thaaaaaat raised a red flag so I asked her about it. We got in a tiny argument (which lasted all of 2 or 3 minutes and involved no name-calling or cusswords) and she basically decided, after that, that I was no better than her a**hole ex, who repeatedly berated her every day over stupid things. I would never do that to her, and guess what? If I had, she'd have killed me. So this just doesn't make sense.
Other than cases like that, or cases where complete losers get with girls that I like somehow, I'm not much of a jealous type.
It's interesting that mds, for one, seems to think it's "dickish" to be jealous. I don't think so. Jealousy, a lot of times, has a reason. If you think something is going on, it prooooobably is.
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I don't trust anyone because I'm cynical.
I'm cynical because I don't trust anyone.