"gets irrationally upset"
So wife is "irrational". Hmm.
This is a classical sleight of hand used by cheating men to dehumanise their wife - who has valid concerns - and try to get other people on their side. It's based on that old goody, trotted out by many men when they are challenged by women, which is that "men are rational creatures while women are hysterical and irrational".
It's not only a sexist trope, it is also idiotic. Because if we really have to classify the sexes according to their irrationality, men would win hands down. ALL humans are emotional. We are animals, with a powerful limbic system that is only thinly overlaid with neocortex. The smartest people are those who recognise and respect their emotions. This makes them much more likely to be able to control their emotions, so they don't spill over destructively onto others.
Which is the sex that
- starts all the wars
- commits the vast majority of rapes and murders
- is most likely to kill their spouse
- is almost unique in terms of their heinous propensity to kill their children when their spouse tries to leave them
- shoots up schools
- is most aggressively xenophobic, beating up and killing marginalised people
- commits suicide most often
- is more likely to abuse substances
- is much more likely to be the aggressor in road rage incidents and engage in aggressive driving behaviors such as speeding, tailgating, and rude gestures
- is more emotionally reactive at work and prone to quit in a huff
- is more likely to get into physical and/or verbal fights?
It's not women. In fact, the evidence is that men as a sex are not in control of their emotions and are as a result very dangerous to the rest of us.
The truly "irrational" one in OP's situation is OP. He is having an emotional affair with his colleague while deluding himself that it's not an affair. And he uses the misogynist trope that women are hysterical to dismiss his wife's very clear eyed concerns and the 99% of poster on this board who have told him, "YOU ARE HAVING AN EMOTIONAL AFFAIR!"
Yet another silly destructive little man, full of puff and ego and no self-awareness at all.