My theory is most people have mid life crises the difference is if you spouse cheated it's really really hard to justify your choices and the temptation is worse.This is me right now. I should say it wasn't always like this after my wife's cheating. I went for years not really thinking about it much, raising kids and having a fairly normal marriage. But about 6 months ago, I started a downward spiral of middle-age regret about a lot of things, not just how I acted after discovering my wife's infidelity, and I started obsessing over it, which led to snooping, which led to the discovery of the serial cheating during that time that I was previously unaware of. My point is that it may seem right now that you can get past this, and maybe for some time you will, but it's very likely to come back to bite you at some point in your life. My advice is not to risk that, to not spend precious years of your life courting this potential emotional peril, at which point you'll find yourself further down the road of life with fewer years left. Don't be me, in other words.
If you are saying she hid her serial cheating then your wife effectively stole your agency twice, first by cheating and then by hiding her additional cheating. That is really rough.