4. Your standards are unrealistic.
It’s not as though your life as a single person is so bad that any partner will do. But if you’re feeling regret over someone you might have prematurely ruled out, your standards may be too high for mere mortals to reach.
Actions to take: Get clear on the must-have qualities in your future partner and distinguish them from the nice-to-have qualities. By all means, hang onto the dealbreakers. But be willing to consider someone who has all the must-haves but few (or none) of the nice-to-haves. It could be they’ve got qualities you’ll enjoy even more.