My S.O. and I both have hero complexes.
We both try to do a lot so the other is impressed and indebted.
Because we're BOTH like this, we run out of things to repay each other with very quickly...
...which is why sex 365 days a year hasn't been a problem so far.
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On topic, I think that when one comes onto CP to vehemently bitch about being hard-done by that they have a concrete position first, and not just an overly-developed sense of entitlement.