You just haven’t met your hole yet.

r/shes12andiamdeep

We also have the people complaining about things not being deep enough, how many years left?

What if your relationship partner got badly sick and becomes more of a weight than before? Should you disregard what you have lived together because it is accrued and leave them because it is going to get worse in the future?

Yes, that’s a good example for something that follows the rational use case. But let’s not take a toxic relationship extreme, I think in the case of a human relationship, the sunk cost may sometimes positivly contribute to the affection/intimacy/love. The sunk cost created memories, habits, foundations for a relationship that you cannot just suddenly ignore and only look at what comes in the future.
I think one must be careful about applying rational principles telling you to not listen to your emotions to subjects where reason doesn’t play the main role.

I wonder if the sunk cost fallacy is valid for a situation where emotions is a requirement, for example a human relationship.