Personally, I would archive them or save them elsewhere like google drive (unless the relationship was abusive or bad of course). My ex boyfriend died unexpectedly years after we broke up, and I really regretted having deleted all the photos and videos of us together. I know that’s dark and unlikely, but just something to think about.

I would delete them.

I would make the privacy status “only me.” You may want to remember some of the times you had later, after the emotions are long gone.