[33girl]

It all depends on the people involved. One of my sisters (we'll call her Ann) was NOTORIOUS for this - say she's originally friends with Beth, and Beth has a friend named Cassie. Ann starts getting together with Cassie and eventually cuts Beth out of the equation altogether and messes up Beth and Cassie's friendship. The first time that happened, I was just like "oh well, that's the way friendships are sometimes." By about the fifth time I thought otherwise.

Anytime I've had 2 friends get "close" it's been mostly because they share an interest I don't - say they're both into John Grisham or something. They can gab about that together but I'm not offended, because I really don't care and they don't dump me as a friend.

But if you don't want Friend 1 and Friend 2 to get together because then you can't bitch about Friend 1 to Friend 2 - you're the crappy friend here, not them. That's just messed up.