You have a crush - and it's not your partner!

A co-worker recently presented us with this dilemma:

"A friend of mine is in a committed relationship, but is attracted to this other chick who's also in a committed relationship. All four know each other, and it's obvious when my friend is around them that he's nervous. What would you do? Try to hide it? 'Fess up?

"I told him to tell the other couple that he has a crush on the girl, but it's nothing more than that. But, don't tell his own partner because his girlfriend is jealous and wouldn't want them to hang out anymore."

Alisha: Quite the dilemma, and I bet it's one that comes up more often than we think - especially for those of us who tend to gravitate toward groups of people when we go out.
Deirdre: I agree. Whether you're in a committed relationship or not, you can't help who you're attracted to. It's whether you act on that attraction that makes the difference.
Alisha: Which means drinking around said attraction is a bad idea! That's when you might lose control of your actions. So the question is, try to hide it or should one fess up to his desires? What would you do?
Deirdre: I would ride it out. The thing about crushes is, they're transitory. They're often based in illusion, or what you think you know about a person. Once you get to know that person, whatever you found so beguiling in them often fades. Time crushes most crushes.
Alisha: I'm with you on this but for a different reason. If you're in a committed relationship, then you're just that - committed to each other. You shouldn't be macking on someone else. To notice one's beauty is one thing; to dream about being with a different partner crosses a big line.
Deirdre: Would you hide your attraction to someone else from your husband, or confess it?
Alisha: Confess it. Plus, there's a difference between admiring one's beauty and having a crush on someone. As a married person who is totally in love with my spouse, I'm not going to develop a crush. I am, however, open to fully admitting who I think is hot.
Deirdre: And your husband is OK with that? Does he do the same?
Alisha: Oh yeah! It's in our nature to notice if someone is attractive. Anyone who doesn't notice or stare at a gorgeous person is lying about it or totally kidding themselves.
Deirdre: Did you notice our co-worker suggested telling the other couple about the attraction, but not to tell the guy's own jealous girlfriend? What a way to imperil the friendship. And that chick is gonna want to cut somebody when she finds out -- and you KNOW she'll find out. If this is going to be discussed, it should be with one's partner, not the partner's friends.
Alisha: Your partner should be the first to know, no doubt about it.
Deirdre: However, I contend that if you know A) you have a harmless crush, no more, and B) such information will hurt your partner, why tell them?
Alisha: If it's truly harmless, what's the harm in telling?
Deirdre: Girl, you're being rational. Jealousy is an irrational emotion.
Deirdre: But I have to add that if your crush doesn't eventually go away, or you find yourself developing deeper feelings for that person, it's a warning sign that there may be a problem in your relationship. And that DOES need to be discussed.
Alisha: That's the point. There should be communication going on from the start. Your partner shouldn't be finding out you've developed crushes on people after months of drooling.