When ever a relationship ends, there is always a certain amount of stuff that is left at your residence. Some of it is left accidentally while some is left intentionally. What ever the reason, the stuff must be returned.
Of course, just doing a dump and run is probably the least painful course of action. You put everything into a couple of bags and leave them on her porch. And, with any degree of luck, you won’t run into your former whatever. But, if that doesn’t work, you will need to arrange for a drop off day and time. But, regardless of the method, you need to get rid of her stuff if you ever hope to have closure.