Have you/would you stay with someone if they cheated?

Initially before reading these replies, I was dead-set on staying and forgiving my cheating gf/wife. If it were my gf I could obviously understand as relationships exist to see if people are compatible with each other, and I wouldn't hold it against her or be bitter. If it were my wife, I would be forgiving, because I always think that I have just as much of a chance of losing myself in a "moment of weakness" or would be tempted to try something new. Maybe I'm deluding myself into thinking that the best case scenario of genuine repentance from the cheating party would occur and they would make an utmost effort to patch up our relationship, but I would be forgiving.

However, I'm now moreso undecided after reading the KEY point of cheating being a definite stab to the concept of trust. That's deep, and as forgiving as you can be, you would also have to be incredibly trusting (not necessarily naive) to keep the relationship in a stable shape. Of course, I can say that I would be willing to trust, but perhaps my personality will subtly change towards my gf/wife after I caught them cheating, and things would eventually become sour over time. I would like to think that cheating is a regrettable mistake, even though that might not always be the case with some people and their lusts.

Jam it back in, in the dark.