AIBU to think that a person's relationship status is more to do with their attachment style (i.e. whether they're avoidant, anxious, or secure) than other attributes such as whether they're good-looking, a high earner, tall, well educated, a nice person, etc.?
I've been single forever and during this time everyone I know whose relationship has ended through divorce, etc. is now in a new one, whereas the few other people I know who are single have also remained single throughout the same period. I can't think of anyone whose status has changed, other than being temporarily between relationships - everyone just seems to revert to their personal status quo.
I also know, or know of, people who are conventionally very unattractive, or who have mental health issues making them difficult to live with, or who are disabled, or overweight - all things which would probably be seen objectively as being potentially off-putting when trying to find a partner - who are in long-term successful relationships.
So, in short, it seems that what really matters when trying to find a partner is simply whether or not you're good at relationships - and if you're not you're basically buggered, even if you're gorgeous, fabulously wealthy and have a great personality.