Depending on how single rates are measured surveys/studies give quite different results. Some official government data (US) only checks if people live in a registered partnership in the same household. This yields of course wildly different numbers than what i am about to quote especially among young people. So it’s best to turn to actual survey data to measure single rates across young people. This survey (https://www.pewresearch.org/short-reads/2023/02/08/for-valentines-day-5-facts-about-single-americans/) finds single rates of 34% (women) and 63% (men) for people aged 18-29. This is undeniably a huge disparity. The single rate among this age cohort is roughly double for men in comparison to women.

So how can that be explained? There are living round about 27.3 million men and 26.3 million women in the US. So naturally the single rate for men will be somewhat higher. But the demographic difference doesn't explain why the single rate is almost double for men compared to women.