One ex in particular I've remained very close to. Last time we had anything romantic between us was about 17 years ago. She is a very important part of my life. While we live far apart and rarely see each other, we email and talk. I've made it clear to any females that enter my life now that cutting off contact with her is not an option, this includes a now ex-wife who was not happy with it all. The way I see it, unless one person did something shitty to end the relationship AND if you spent a lot of time with this person (years, not months) then it is stupid to not have contact. I for one have a shit load of friends but very few close friends. Keeping the close friends is more important to me know than it was a decade ago to be sure (I'm 45).