How to forgive and forget?

Human nature is to remember people's wrong doing easier than people right doing.
It is difficult to forgive and forget and not many people can do it.
It also depends on the severity of the doings.
If it is to the extend of causing too much grief and hurt, it might not be easy to forgive, what more forget.
On a personal note, try not to take this into your heart, pour it out, move on with life and if u need to avoid that person/situation.