9 hard truths about relationships no one wants to believe

Everyone knows relationships are hard, and take effort to maintain, and sometimes disappoint you.

Except, of course, your relationship. That's different. Or so everyone likes to believe.

Below, we've listed some of the truest but hardest-to-accept insights about modern romance. If you can get past these somewhat unsettling ideas, you'll be more likely to have a happy and fulfilling partnership.

SEE ALSO: Dr. Ruth has interviewed thousands of people about their sex lives — and she's found the biggest threat to a relationship happens outside the bedroom

We're often attracted to people who will later drive us crazy

While researching habits and personality for her book "The Four Tendencies," Gretchen Rubin noticed a curious phenomenon. People she'd labeled "rebels" often paired up romantically with people she'd labeled "obligers."

Rebels resist both inner and outer expectations; if you ask a rebel to do something, they'll likely resist. Obligers meet outer expectations but don't always meet inner ones; they usually need some form of external accountability.

Rubin told Business Insider:

"If you're an upholder, you live life according to a schedule. [For example] you never miss your daily run, and you always eat fewer than 30 grams of carbs a day, and you always go to bed by 11. It could be exciting be swept off your feet by somebody who feels very free and not confined."

But over time, the novelty may wear off and these two different approaches can come into conflict. To be sure, rebels and obligers — and any two types of people — can be happy together. But it's worth keeping this pattern in mind.

There's probably no such thing as 'the one'

Out of the thousands of eligible singles just waiting for a swipe right, how do you know who's the right one for you?

Trick question: There isn't a right one.

That's according to Esther Perel, who is a couples therapist as well as the author of "Mating in Captivity" and "The State of Affairs." Perel previously told Business Insider: "There is a one that you choose and with whom you decide that you want to build something. But in my opinion, there could also have been others — you just chose this one."

Once you've chosen someone, you work to make that person a better fit.

You may be less likely to break up with your partner if you have a pet or a joint bank account

Psychologists call them "material constraints": Think a house you co-own, a joint bank account, or a pet you both take care of.

Research suggests that material constraints make a breakup a lot less likely. In fact, according to a 2011 study of unmarried men and women in heterosexual relationships, adding just one additional material constraint is linked to a 10% increase in a couple's chances of staying together.

Presumably, that's because it's harder to disentangle yourself from the relationship when it's not just the two of you. So it's wise — if slightly uncomfortable — to think in advance about what you'd do if the relationship dissolved.