It's some loss of energy but more the realization that ROI becomes a bigger deal. The nihilism can come from anything red pill, since you need to understand the meaning of loss, suffering, or challenge with God as the one you can trust, when times are hard. That especially is true when dealing with women, to be honest, since having an expectation that they will or will not do something, or are something that they aren't, will crush you. I'm being generic there so as not to elicit calls from the "black pill" crowd.
I think the biggest issue I've come to fully understand now, which makes things both worse and better, is that you really do need a woman that "chooses you". That brings up a whole other host of issues in a world where overall quality is very low and hard to find.