I have a couple of "AlphaMale" friends who I've known since around my college days. Both handsome. Both well-built and athletic. Both never-married and now in their forties
I finally realized why they never married. They never needed to learn relationship skills. Whenever their current relationship hit a bump, it was always easier to move on to the next girl on the waiting list than to figure out a way to make the current relationship work
One thing I've noticed about women in relationships, is that there's a stage where she's decided that this is a guy she would like to commit to her. So she's on her best behavior and trying hard to convince the guy that she's the one he should settle down with. Mr AlphaMale is quite happy to let that stage extend as far as the girlfriend is willing to. But at the point where she's no longer willing to be on best behavior and starts getting antsy, he decides it's time to move on.
The first AlphaMale friend just broke up with latest girlfriend when I last talked with him. The second is currently trying to break up with his current 20-year-old girlfriend (22 years younger than him), but she's doing a "Fatal Attraction" bit on him, because she can't stand the thought of being dumped by him.
Why does AlphaMale do this? Because he can. Because for every AlphaMale there's a line of women who want him, and keep passing up with disinterest all the "Joe Shmoe"-types who would be willing to commit.
Back in my early days at a consulting company I worked at, the president's secretary was always chasing after one Mr AlphaMale after another. She was absolutely gorgeous, and extremely smart and capable. All the guys wanted to date her (myself included). She would not be satisfied with anyone less than an independently wealthy business owner. I met her many years later. She was 40, and still never married
The truth is, that is true for almost every man if he is willing to exercise choice. There is always a variety of women available for any man who is appealing to women. Joe Schmoe isn't chronically rejected because he is willing to commit. He is rejected because women value him less as an appealing male. If he makes some adjustments, he can be valued more. Until then, he will be passed up by attractive women.
And that's a good thing - I say many times on FR that people tend to be rejected as companions for substantive grounds, and not shallow grounds. This is a bitter pill for many to swallow, but it is true.