I think that’s an important thing that seems to get overlooked when this topic comes up. It’s a two-way street- if you just want to vent, be sure to say so. Don’t get upset when your partner doesn’t just assume that’s what you want.

Of course, the “two-way street” thing really needs to be emphasized, since the person venting is likely frustrated and can’t always be expected to be clearheaded enough to remember to communicate it properly. Also, if all they ever want to do is vent, y’know…maybe that’s a pattern you should pick up on eventually (the hypothetical “you,” of course. Not the person I’m specifically replying to :P)