Cheating or Not?

Yes, I'm a slacker. I haven't posted in ages. But then, I did promise this game, didn't I? Not all of these things happened to me, so a few events have been altered and persons changed to protect their identities.

Happenings in b-school... is someone cheating or not?

(a) Pretty girl with boyfriend chats with her guy friend who has a girlfriend at a party in downtown. They laugh, drink, and hang out. Guy mentions to her that inspite of having a girlfirend he is available.... cheating or not?

(b) Girl with boyfriend spends time talking to old hook up friend... with the intent of making her boyfriend jealous... cheating or not?

(c) Guy with girlfriend spends prolonged periods of time studying with other girls, who are not in his section or on a team with him... cheating or not?

(d) Guy with girlfriend regularly goes to local bars, drinks, and makes out with local undergrads... cheating or not?

oh the list is endless!