Deciding whether to forgive or dump a partner after they cheat is a very personal choice, and there are so many different factors that play into a person's decison.
Of course, for better or worse, there is always a chorus of voices eager to tell couples how to move forward.
Some people abide by the saying "once a cheater, always a cheater" and believe the first sight of infidelity is immediate grounds for a breakup. Others believe in the power of forgiveness, and that it's worth looking at counseling or other avenues to move forward. Since every relationship is different, there's truly no guide book, but hearing other people's stories can help serve as a compass when you're at a relationship cross roads.
While these are anecdotal and not prescriptive, the hope is that they'll help others facing difficult choices.