Harlequin Romances isn't exactly going broke selling girls books about how a guy comes into the girl's life and does something as simple as fixing her car to make her life right and sweeps her off her feet.
You would be amazed at the "mileage" you can get just by taking her car down to the shop.
First, if you're not familiar with the book The Rules here is a summary of "The Rules" in the book, which you need to know to understand the satire.
Or do an Google Search to search for web pages discussing this book. Learn enough to get by and look cool, though you won't need it much after you have her hooked.
Or tell your wife you just don't want to wear a ring; invent some sort of bizarre hand disease or rice picker accident.
Girls love the "bad boy." They hope they can "reform" him, or they're a case of point #11 above. Invent deep intimate stuff you can tell her in bed, she'll go for it.
Well, this isn't a thing to so much try to do as a reminder to be yourself.
If you shack up, don't alter your own life just to make it easier for her.
Compare -- 5 seconds of your time each day to put down the seat vs. And they don't like us staring at other girls' either. Anyway, they're watching for this so don't get caught. Drop hints and pretend like some day you want to be married to her, but don't actually do it.
You can even get engaged if you want to lock in some regular pussy.