The problem is quite simple:

Men are attracted to women who are on their level, and above, but women don't go like that. Women are only attracted to the top 20% of men. Women will never date someone on their level, or even a few levels above them, only the absolute best.

Women would rather have a small share of an alpha man than a beta man to herself. So that's what they do. They share the chads.

When they hit the wall they panic and realise they are actually subhuman scum and then settle for the nearest beta willing to support them while they continue to share chads dick with a 100 other women. They then cuckhold the beta with chads children.

TLDR women have unrealistic expectations regarding the partners they deserve, while men have realistic ones.