Friend vs Coach

What is the best way to support a friend who wants to have a bitchfest? I don’t find it helpful to go down a rabbit hole of “he’s the worst” etc, even though I know that’s what my friend wants me to do with her. I’ve always been more of a “look on the bright side” kind of person and have trouble holding space when people want to wallow in what seems like an unhelpful way. I just don’t see any net positive in it. But, maybe its just part of the journey? Maybe you need to vent, and get out all the negative before you can move into the positive? But what about when you vent, and still feel bad at the end of it, rather than a release? I want to be able to hold space better, without trying to fix.