This is because you're setting yourself up for failure. You are the most desirable for men when you're young and as such you should choose the most desirable men- male models, multi millionaires, professional athletes. If you choose an average guy he will grow his career and generally have money when he reaches 30, this is when he looks at you and thinks hey she isn't as attractive as she once was I deserve better. And just like that he breaks up with you and marries a 20yr old within a few months. Making you the women who helped a man and gave everything to him just for him to excel and dump you when he reaches the top.

This is why women should never help build a man because they will never be loyal in the end. Wait at the finish line for successful men dont be the women who helps him build.

TDLR: A woman's loyalty is tested when her man has nothing; a man's loyalty is tested when he has everything. But if you as a women give a man who has nothing loyalty you will find he doesnt repay the favor.