DH doesn't talk to any of his exes but that's more because he's moved so much that he's lost contact with everyone. If he did talk to his exes I probably wouldn't mind since I still talk to most of mine. I'm from a town with a population of 8000 though so you run into your exes a lot. Besides my ex fiance married one of my best friends lol. My ex fiance and my husband are pretty good friends and he and I still have a pretty good friendship so things work. I think everyone is different though. Some people can be friends with their exes and some can't.
My DH doesn't talk to any of his ex's but that was his own decision because none of them ended on good terms the only time I talked to one of his ex's was cuz she wanted to give my son the savings bond he gave her daughter and the pics she had of him while he was in the army, she admitted that she went to me because she wanted to also see how he was doing and she knew he would've never replied back to her. I had one ex I had on my facebook just because after we broke up we became really close friends but we stopped talking a couple years before I even got married and I just barely deleted him, he was the only one I had out of respect for my husband and after our friendship ended i never saw the point in being friends with an ex again
My most recent ex is SOs best friend and best man at our wedding in Feb lol.
SO still talks to the girl that he was completely infatuated with for years even though we are together (we weren't when he was infatuated), she is unofficial godmother to each of our boys and a good friend of mine. Doesn't bother me that he used to have feelings for her, the key words there are USED TO.
I hang out with my ex, he gives me driving lessons. SO doesn't care cos he knows nothing will happen with that cos I have no feelings there other than mates.