Can anyone identify this plant?

[Therealmetherealme]

This weed is taking up space in one of my flowerbeds, but I sprinkled a lot of seeds last year and don't want to remove it in case it might flower. Does anyone know what is? Or can you an identifier app?

I’d challenge that description. Yes, it’s vigorous and invasive, and for that reason most people don’t want it in their garden, but the flowers are showy and equal to many garden flowers - indeed there are garden cultivars of rosebay. Unless (as is not unusual with “common names” you are using “rosebay willowherb” for some other species?”Small pink flowers” wouldn’t apply to Great willowherb (aka Codlins and Cream) or to New Zealand willowherb (a tiny plant with disproportionate flowers), but would be spot on for most other willowherbs.

@MereDintofPandiculation yes, you might be right about my use of the name, it's what my dad called it when we saw it in the woods when I was a kid.
I suppose by weed, I just mean wild plant, not that you need to dig it out necessarily. I think a few rosebay willowherbs (or whatever this is) are nice in the garden, but they do need a bit of controlling unless you want them everywhere.

I have a personal campaign against dividing plants into “plants” and “weeds”. I think there are some things most people would regard as unwelcome, basically thuggish plants with copious seeds or long runners. But that would include spreading bamboos, “mile a minute vine”, japanese knotweed, Himalayan Balsam, all of which are garden plants (ie introduced for garden use, not part of the UK wild flora). And regarding all wild plants as weeds would deprive us of lily-of-the-valley, primrose, honeysuckle, Actaea spicata, Geranium sanguineum etc, etc. Even the hated wild ground elder has a variegated form sold for garden use. The “wild flower meadows” that are all the rage are usually a collection of cornfield weeds (with some alien species thrown in)

I don’t think you can beat the well known definition “a weed is a plant growing where you don’t want it”. Which means of course you can’t answer questions like “is this a plant or a weed?” other than by saying what the plant is and that it’s up to them to decide.