Bower, I don't think it's Rose Campion.
https://wimastergardener.org/article...nis-coronaria/
I have Rose Campion and love it. A friend was helping me to weed and she suggested that it was invasive, but I told her that I had planted seedlings all over because it looks so pretty interspersed with anything. They are really flourishing with all the rain we had early on, and now I am wondering if they really are invasive {LOL}. Not a problem as they are easy enough to pull if I have to
.
Linda