How do you come to peace with the money you spent on a stupid feminist that demands alimony, money, free dates and so on?

Crosspost "How do you come to peace with the money you spent on an LVM?" from /r/FemaleDatingStrategy:

For example you paid for their food or gifts or something in the past, while you could have used the money for your own self growth or paying college debt. How do you come to peace with the money you spent instead of seriously regretting it and getting upset about how stupid it was? I'm really kicking myself over it