Does anyone know what type of weed this is and how to treat it?

Has it ever bloomed?
Google suggests silene, also cress... the first is a desirable flower...


How long has this plant been there?
When you lift rocks are the stalks all rooted together?

Seems familiar...

The roots are all connected together. It showed up in my raised garden bed last year. I have sprayed it with round up but it keeps coming back. I have not seen it bloom.

Kinda looks like diodia, but you should've seen flowers...
http://www.namethatplant.net/p...
https://warcapps.usgs.gov/Plan...

Most of the google lens suggestions are desirable wildflowers...

The roots look to be one big system that run with in the raised bed. I cannot find the main root ball and I've dug done 16".

Yeah, that's typical of Virginia buttonweed, but I usually see flowers... Even where it gets mowed...

Have you visited the links I posted?
I encourage buttonweed for the tersa moths that use it as a host plant.
https://www.caterpillaridentif...

I did. I normally pull it as soon as I see it. I will let it go until it blooms before I treat it.