[MindBomber]

The "Bro" is friends with both sides of the couple, and that can be a very difficult position when a relationship ends. Not that I'm condoning the break in trust, but I definitely understand it.

The best decision would have likely been to vent to someone who has no emotional relationship with the now ex-gf, if Jordan wants the honest truth. Talking to a mutual friend is a great idea at times, because they can provide a neutral perspective on the relationship and generally want to see it succeed. Venting though, calling the ex-gf a whore, making accusations, saying things that you know aren't true to someone who cares about the ex-gf is almost as bad as saying them to the ex-gf herself. Hearing those things can hurt the friend in the same way it hurts the ex-gf, and almost inevitably the comments will find their way back to the ex-gf as a result. If you need to vent do it with someone who is completely neutral.

One last piece of advice, don't start fights over silly things like having guy friends if she's given no reason to warrant a lack of trust.