Dude! You don't need to know everything about her.

Are you dating a stranger? According to a new survey conducted by a British beauty retailer, 54 percent of men couldn’t rattle off their partner’s cell phone number, 12 percent didn’t know her D.O.B., and one in 10 didn’t even know her job title. Ouch. Maybe because in today's World you can have technology help with instant access to info, you don't need to remember some of this info. The simple truth is, keeping the names of her coworkers and her hair stylist straight isn’t always easy (or even necessary). There’s such a thing as TMI (too much info)—as well as a handful of non-negotiable(s). That’s why I determined 10 things you simply don’t need to know about her, and 10 things you better have memorized or easy access to.

(And don’t worry—I don’t know anyone who memorizes phone numbers these days, either!)

"I always wonder if the adviser takes his/her own advice.... Is the author if this blog in a relationship?" Just wondering ~a secret admirer.  FYI, here is what I've learned  these are lessons from my own successful relationships and one marriage, which ended in divorce. But we remained friends afterwards until we both moved on wishing each other well. That's what you do when you truly love someone. You want them to be happy, with or without you. But like most people it was the failed relationships that hurt the most that taught me the greatest lessons.

10 Things You Don’t Need to Know About Her:

1. Her Favorite Designer
Can’t tell the difference between Tory Burch and Rag & Bone for the life of you? That’s OK: Recognizing a new dress or top (and complimenting her on it) goes a lot further.

2. What Her Perfume’s Called
That’s why she has aBFF—and if the perfume bottle’s running low this holiday season, just call her for the name.

3. Her Favorite Makeup
Sometimes a little mystery is good. Wouldn’t you rather believe she looks and feels awesome all the time because that’s just the way she wakes up looking and feeling every morning?

4. When or What She Gets Waxed
Same deal—a trip to the “spa” is all the information you need.

5. Her Hair Stylist’s Name
Part of being together means having your separate interests, too. Some names are must-knows; others leave you sounding like a character from Legally Blonde. This one falls in the latter category.

6. Her Best Friend’s Latest Boyfriend Drama
If she’s venting to you about her BFF’s latest crisis, listen. But know that by no means are you required to remember this information—or cut ties with the guy because of it.

7. If It’s That Time of the Month
Unless you’re trying to get her pregnant—or worried she might be—don’t worry about her cycle. If she’s in a bad mood, you’ll blame that weird thing called PMS, and she’ll lose it.

8. Her Ring Size
If you’re at the point where you need to know, you probably already do. Otherwise, there’s no need.

9. The Names of All Her Exes
Knowing she’s got an ex-husband or was in a 10-year relationship can be useful information—and explain a lot about why she is who she is. Details about the DJ, the guy she met on spring break, or the Pro athlete she dated simply aren’t necessary or wanted.

10. Her Salary
Until you’re serious—splitting finances, living together, paying for kids’ education—knowing the number of zeros on her paycheck shouldn’t matter. And remember: Picking up the tab should never be a matter of who makes more.

. . . And 10 Things You should know:

1. Small, Medium, or Large
You’re signing the two of you up for a race, and the free T-shirt section needs her size. If you order a small and it’s too small, she’ll feel—well, large—but if she thinks you think she’s a medium (when she’s clearly a small), you’re in the doghouse. Just ask.

2. Where She’s From
Whether she’s a born-and-bred St. Martiner, a New Yorker at heart, or a small-town European, her hometown matters. It probably says a lot about how she grew up—and how she’ll continue to grow.

3. Where She Went to School
Same reasoning: It’s important to her. Plus, it was four really fun years of her life that you may or may not have been present for. Mix up the University of Kansas with Kansas State, and you’ll never hear the end of it.

4. The Names of Her Parents, Siblings, and Best Friends
She talks about them enough, so you should be able to remember their names. Bonus points for coworkers and bosses.

5. How to Cheer Her Up
Knowing the quick fix for a bad day is good for both of you. If a pack of Oreos, Homeland on DVD, or takeout from her favorite Chinese place can brighten her up, you’ll see the rewards, too. The little things show you notice—and care.

6. The Signs of a Bad Mood
Being able to pinpoint bad mood warning signs she doesn’t even notice—ie: her voice when she’s hungry, or a less than enthusiastic response to a text—relay that you’re learning about her . . . better than she may even know. Plus, you’ll be better equipped to handle what could be coming your way.

7. Her Middle Name
If her doctor, employer, and credit card company know it, so should you.

8. Her Favorite Music
And make it an option on long car rides.

9. What She Doesn’t Eat
Take her to a steakhouse when she’s told you twice that red meat’s not her thing, and you’ve signed yourself up for an awkward date and a “do you even listen to me?” conversation.

10. Her Favorite Flower
 check out another blog post. Guy Wisdom!. You’ll thank me later.