It is a part of the sunk cost fallacy with the more investment in, the harder it is to break ties. Relationships suffer this often and then stay together through convenience or, the difficulty of breaking up.
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Exactly so how I wish sometimes people can be deeply invested yet Still feel indifferent or unconcerned just a little
it is the curse of complacency and taking for granted what one has. If in the relationship one decides to just walk away from what is essentially a stagnant relationship, the other will feel victimized, even though they did nothing to actually support improvement themselves.