Should I let on that I know my spouse is cheating?

I am the kind of woman who can't hold anything in, so that answers the question right there for me.
However, all people operate differently based on their personalities.

Most people seem to think that only women at out or act up when they "assume" and later find out their man had been dipping into another sugar jar. But I have encountered many of men who are just as emotional over the topic of infidelity.

In marriages, however, I tend to notice the trend where a woman is the one more likely to file for a divorce if she finds her mate was unfaithful. Men seem to consider their "slip" as a side effect of long term (short term) ball and chain syndrome and feel it perfectly acceptable to stay in their marriages if the fling meant nothing to them and they can honestly state they still love their wives.

So? Do you, when you have sufficient proof to open the cheating can of worms, come out with the evidence Colombo style or act like you know nothing and see if the affair/fling/rubbish will stop on it's own?

Many women and men have pretended they have had no clue of their partner's infidelity, especially if it was found out to be a drunken lay or a short term fling. A one night stand could turn out to be a one time issue due to the influence of alcohol and may never take place again, like wise, a fling may be something for which the partner bears so much guilt there will never be a repeat offence.
However, a partner who keeps silent on these matters may give their spouse the belief that they have gotten away with their philandering and they may be so enticed to try at it again.

Of course, calling your partner out on their philandering has a wide range of drama to follow. Some will deny and the denial will make the situation worse. Some partners are devastated not only by the deceit of the cheater but the brazen denial of the deceit even after evidence is produced. That shatters the trust of the relationship and when trust is broken, often there is no mending of it. parties have to decide if they can move past the pain or move on to someone new.
Even when the affair has been admitted, there is still the question of where do we go from here, which makes it seem so much easier to just not say anything.

Of course, living with the burden/secret of knowing and watching your partner go back and forth as if they are doing no ill, often makes the spouse ill. The trust is already gone if both parties are keeping secrets and living a lie.

Each individual has to know how much strain their hearts and their minds can bear. they also have to know how much faithfulness in a relationship means to them. If ti is important that your partner loves and shares intimacy with only you - Call the cheater out. Don't allow it to linger. The second step is asking yourself if this is the kind of person you want or deserve.