You don't. To do so would make it forgivable.
When your not sure if you can make it without them...is there really any other choice?
By finding some thing else to worry about.
speaking from experience...time dulls those unforgivable actions..so that eventually they hold no power...but the scar remains...and maybe that's a good thing...it keeps you aware.
Easy forgiveness stops you becoming bitter....
Forgiving does not mean you have to forget