1: Have you ever cheated on your girlfriend/boyfriend - Wife/Husband? Nope.
2: If you did, was it a simple kiss? more? Nope.
3: Did you tell them you did?, did he/she forgive you? NA
4: Are you trying to find an excuse, (as in "I was drunk", "Men/women have needs!") Or do you accept you made a mistake and regret it? NA
5: Have someone cheated on you? Did you forgive them? Yes, but that didn't turn out so well in the end. It ended relatively peaceful though, thankfully.
6: If you started a relationship with someone. Or knew that he/she had cheated on someone before going out with them, would you break up/not go out with them? Depends. I believe people can change, however that's easier said than done. I have to assess the person, and to do that, I'd have to have been with them for some time. If it's early on in the relationship, then I'd probably quit it. Cheating tells me you're a weak person, and that irks me even worse than cheating itself does.
7: If you know a person who have cheated. (Cheated = always a cheater) Will you always think of that person as that? And never forgive their mistake. If so, why? (explain) I assume you mean this from the POV of being cheated on, and well... I made the mistake of forgiving once. I won't do it again. The problem with cheating is that most of the time, it fucks with the current relationship too much. Even the one being cheated on is the one trying to let it go O.o