6 experts share the worst piece of relationship advice they've ever heard

Business Insider recently published a roundup of the best relationship advice real people have ever heard.

We learned that love isn't enough for a solid relationship and that it's important to pick and choose your battles. Helpful stuff.

Then we started to wonder: What's the most obviously bad relationship advice out there? The advice that's either outdated or never made any sense in the first place?

So we turned to a series of experts — including a biological anthropologist and a marriage and family therapist — to find out.

Below, we've rounded up six pieces of advice that you've probably heard, but that you definitely shouldn't be taking to heart (pun intended).

SEE ALSO: 9 real people share the best relationship advice they've ever heard

'If you're fighting, your relationship is in trouble'

"It's not that you fight, but how you fight that determines the health and happiness of a relationship. If you never fight or disagree with your partner, one of you may be harboring resentments.

"And, while I'm talking about fighting ... the piece of advice that drives me crazy is, 'Never go to bed angry.' In fact, sometimes a good night's sleep is exactly what you need to think more clearly and fight right."

— Andrea Syrtash, relationship expert and author of "He's Just Not Your Type (And That's a Good Thing)"

'Cyber snooping can save you from choosing the wrong partner'

"First off, if someone gives you this advice, take a look at the quality of that person’s relationship before you choose to follow in their footsteps.

"If you cannot trust your partner, then you've already chosen the wrong one. The bigger question is why you are attracted to a person whom you do not trust. Put simply, snooping destroys trust, which is the foundation of a healthy relationship."

— Emyli Lovz, dating coach

'In order for a relationship to work, it has to be magic right from the start'

"Or really that it has to be anything. Often when people give advice, they're telling you what's true for them.

"And the lesson I learned interviewing hundreds of couples is that there's no one way that love unfolds — or is sustained.

"Some people fall in love at first sight. Others sit next to the same person at the office for years and feel nothing — until, one day, they do.

"The advice I'd give people is to really learn to listen to themselves. And if an answer isn't immediately apparent, check in with your body. I once heard a yoga instructor say that your head can lie to you, but your body never will. I've found that to invariably true and useful in all areas of life — especially relationships."

— Ellen McCarthy, Washington Post reporter and author of "The Real Thing"