Most Helpful Guy
I disagree with the idea that closure is not an option. The key is to find a way to let that person go and move on. Understand that mistakes and regrets have existed and chose to look at them not as negative things but simply as the way it was. Make restitution, achieve peace, and close the door and walk away.
Most Helpful Girl
I agree with @kittykatg in that there really is no such thing as receiving 'closure'.
My ex cheated on me before breaking up with me, of course leaving me distraught. I was a mess for about half a year, thinking that I'd be able to fully move on if he'd just get in touch with me and give me some closure.
Sure enough, a few months later, he did send me a message apologizing, saying he feels terrible for what he did and that he wished it didn't happen. I was glad to receive it, thinking I'd finally be able to put that incident in the past. Surprisingly, I felt no better or any more over it afterwards. I gave it some time to 'sink in', but still no difference. I gave it a lot of thought, and asked myself what I would want him to say that would truly make me feel better.
I had thought him owning up to his mistake and acknowledging that he messed up would suffice. He did just that, but regardless he did what he did and I was just as hurt. Only if you could turn back time or erase the past would 'closure' be attainable with an ex, regardless of how close you two were.