DISCLAIMER: I just want to preface this by saying that this isn't a "wahmen bad" post, and that is not my intention regarding it. I apologize if it's interpreted as such, but you're really trying to read something there that isn't there. 

Truth be told, I think part of the reason why women are much more comfortable being single than men are is that society has been very upfront and honest (perhaps even exaggerative at this point) about the negative characteristics of men.

Good fathers properly warn and teach their daughters about the negative aspects of men. Unfortunately, many of them don't teach their sons regarding the negative aspects of women. 

Additionally, because women have such a strong in-group preference, they are strongly discouraged from identifying negative characteristics within women. This is why (at least I believe so) mothers won't warn their sons about the negative characteristics of women.

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From Purdue:

https://www.purdue.edu/uns/html4ever/2004/041213.Goodwin.gender.html#:~:text=The%20results%20showed%20that%20women,research%20groups%20of%20varying%20sizes.

The results showed that women showed in-group favoritism four times greater than men. Those figures are based on an average of separate studies that involved research groups of varying sizes. "Yes, this research goes against what people think they think, but that is the advantage of collecting data in manner where people can't control their responses," Rudman said.

Also read: https://en.wikipedia.org/wiki/Women-are-wonderful_effect#In-group_bias

Up until very recently, we've been raising boys under the impression that women are perfect angels who truly care about men and aren't remotely shallow at all.

Hell, there's literally an old English poem that writes as such:

What are little girls made of?  Sugar and spice  And all things nice That's what little girls are made of

For reference: https://en.wikipedia.org/wiki/What_Are_Little_Boys_Made_Of%3F
We don't have to "red pill" young boys per se; we just need to be honest with them.

Women are humans. Humans (regardless of biological sex) are inherently selfish and act in their own perceived self-interest. They have their own needs, desires, and preferences; and there's nothing wrong with that. 

We need to stop teaching boys that women should be the central focus of their life and that the only way to achieve fulfillment in life is via women. We need to teach boys that it's okay to be alone, and that you need to know how to be happy alone in order to be happy in a relationship. Relationships simply exist as a potential form to enhance one's life (and oftentimes, relationships act as a source of primary ruin and detriment in many men's lives — we give the youth an overly wholesome view of relationships, even though the vast majority of relationships do not fit that mold) , not to be the end goal of it. 

If men didn't have such unrealistically high expectations placed on women in the first place (which is of no fault other than the environment they were coddled in in their adolescence), they likely would have never had to go through all the mental distress you're seeing huge amounts of young men going through right now.