Why do men act so good at the beginning of relationships and then stop putting in effort?

Anonymous
Why do they stop doing the little things and doing those things that made their partner fall in love with them in the first place? We can’t be surprised women are the main ones filing for divorce when most men are getting too lax and complacent in their relationships. I think a man deserves to get divorced if he’s not doing those things that make his partner feel desired anymore.
Why do men act so good at the beginning of relationships and then stop putting in effort?
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