Most Helpful Guy
You can't. It doesn't matter if you want a closure or not, the other person should want the same thing, otherwise no matter what they won't give you the closure, so you won't get a closure.
Most Helpful Girl
You only get closure from within yourself.. it takes time but one day it'll happen and you'll feel this weight lifted off your shoulders. Never depend on anyone else for closure because you'll never find it. Just do your best to ride it out and remember time heals everything.