How is it possible to cheat?

I mean, I live with my girlfriend. We work from home most of the time.

We don't have much friends, and most of them are in common.

At work i have mostly male colleagues. Few married women with kids.

I almost never meet new people. I would really need to consciously look for it.

Anything we do out of ordinary routine, we inform each other through messaging.

I can't imagine to have one single hour unaccounted for.

We do not travel for work.

I mean, in order to cheat, I would really look and plan for it, very consciously and actively. It will not happen to me and if it will happen, it will be super hard to conceal.

I don't think I'm the only one in this situation, so I'm just curious hiw it happens to people that cheat?

How is it possible to cheat?
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