| I think the thing is, there's some things that you would obviously consider "emotional cheating" (I hate that expression, btw :eww:), and some things that are obviously innocent.
But there's a really huge grey area in the middle, and I don't think there is a clear cut line - it depends on so much, like how healthy your relationship is, how long he's known the friend, etc. Personally, I've always been inclined to err on the side of not jumping to conclusions - I figure there's worse things that being made a fool of, and if the guy is just friends with her, he'll resent it if you split them up. As someone who's very often the friend in these situations, it's not a nice feeling when someone you've known for years is being accused of "emotional cheating" just for being around you, and it reflects really badly on the accuser.
Over jealousy though, I really advise against the "he shouldn't do [x] because he knows I get jealous" school of thought. It's been brought up on here before and I'm sure someone will even if I mention it now. Knowing you have a problem is the first step, yes, but emphasis on "first". Doing something about it is the next one, and it means not expecting others to alter their behaviour around it. The problem with jealousy is that, if you know you're being a bit irrational, it makes it harder for you to judge how irrational; you can be looking at something innocent and be jealous, but equally, you can be looking at something that's totally out of order and think that you're only mad because you're the jealous type.  | 
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