Did for a little bit with one ex once we were ‘over’ everything and had both moved on. Still saw each other from time to time but then became kind of apparent that we were very different people so just mutually allowed it to naturally drift to nothing.
I also had 2 people who I was more than casually seeing but not particularly seriously either so was a lot easier to remain friends, but again as they were from when I lived elsewhere it was just a case of the friendship slowly petering out.
1 person I blocked because it was best for her and her behaviour was terrifying and mildly threatening. 2 others didn’t take the break up well so was better not to stay in touch really.