Friends with ex?

Has anyone ever stayed friends with an ex boyfriend or girlfriend or do you always think its too hard. Is there ever any motives behind someone wanting to stay friends with them or what? At first me and my ex had sex a few trimes and then he thought it was a bad idea as it was not fair to ether of us and he suggested us be friends. I think it is very hard in my opinion bc although our relationship was short I found him to be someone who I would be with for a long time. So has anyone had a sucessful friendship and how did it turn out, did you get back together or what happened/
Friends with ex?
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