It’s actually ONE basic trait—Putting your spouse’s needs before your own.
I have done lots of work on myself, sometimes acting contrary to what you would think would make a successful relationship. The payoff is I like being is a relationship with her and that creates a positive feedback loop. What is funny the thing she said the more successful and good looking the men she dated, the more f'ed up they were, the less secure with themselves they were, the more they were unauthentic. Why did she go out with me??? Hmmm we met waiting in line for a table at a restaurant. I talked to her and her friend, thought she was drop dead and ...as I was leaving I placed my phone on her table as I went to the rest room, whispered in her ear that I wanted her to add her phone number to my phone. I came back, saw the phone on the edge of her table. I picked it up and her name and number were entered... She confessed that was the cutest, most assertive and sexually exciting thing ANY man had done with her. Lightbulb went off moment for me. Women love assertive, confident men. And...that leads to a good marriage.
Aye — Though sometimes it's amazing how blind we [humanity] are to recognizing the needs of others even in the general sense.
(It doesn't help that there's a rather large internal drive to present a false front and try to hide needs either.)