Marriage: One unfaithfulness exception, or none?

[optimus prime]

Ugh. I know these things happen frequently nowadays (affairs that is) but I think one should go into a marriage without every worrying about this. You shouldn't marry someone who you think would be capable of this. The fact that you'd like to clear up consequences and whatnot already means either you don't trust her completely, or you don't trust yourself. Either one means you're probably not ready to get married.

Also, I don't think I could stay married to someone who betrayed me like that. I could get past a drunken makeout if she showed real regret and it was clear to me that she meant it, but anything beyond that would break my heart.