How to move past cheating..?

If you or you spouse/bf/gf have ever cheated and you stayed together.. how did you do it?

How did you move past that? Were you able to be happy together again?

How did that change your relationship ?

How has time helped?

How did you/they forgive?

Why did you/they cheat?

Just HOW???

I really don’t want to hear “just leave them, move on” I really want to know HOW you pushed passed it.