6 signs you and your partner are ready to get married

"Hopefully, you're not getting married or thinking about long-term commitment before you've talked about future goals," Syrtash said.

Discussion topics should include kids, religion, and finances.

"If you feel that you've talked through significant future goals together and you're aligned, that's also a good sign."

Karl Pillemer, a professor of human development at Cornell University, spoke with a series of older Americans for his book "30 Lessons for Loving" and learned about the importance of shared values.

One 86-year-old man told Pillemer that it's important to find out from your partner: "What do they care about? How do they think about the world? What matters to them?"

Money is a common source of conflict in a marriage, Syrtash said. "So we want to have open conversations before we are legally bound to each other."

For example, is one person coming into the relationship with significant student loans or credit-card debt?

According to Michelle Brownstein, Vice President of Private Client Services at Personal Capital, every couple should have three important money conversations: how they spend and save, how they envision a potential child's future, and whether to rent or buy a home.

Syrtash said you and your partner should be on the same page about whether to have children. What's more, you should have an open discussion about religion — and whether you want to raise your kids to follow a particular faith.

"I hear this a lot from couples I've worked with," she said. "They're of different faiths, and they didn't really talk about while they were dating. Then, when children come into the picture, they have to negotiate these things, and they're like, 'Why didn't we ever think about this before?'"

You and your partner may also want to discuss your individual views on childrearing, since clashes around parenting styles are a common source of discord — and even divorce.

"It sounds very unsexy, but it's good to communicate about sex," Syrtash said. Specifically, does your partner have any STIs? You may also want to discuss your needs and expectations around sex.

Relationship therapist Rachel Sussman said the most common sexual problem she sees in her practice is mismatched sex drives. Typically, one person wants to have sex more often than the other, who's either happy with the amount of sex they're having or wants even less.

The earlier you talk about sex, the easier it'll be spot any potential issues.

"If you aren't overthinking it," Syrtash said," that's a good first step."

"If you're just like, 'Intuitively, this feels different from all my other relationships in terms of not only our connection, but our lifestyle, our trust, our respect, our shared values and goals,' that's certainly a sign that you're forward-thinking."

"It's so easy to get caught up in checklists," Syrtash said. "Checking off all the boxes of what we think matters in a partnership or in a person."

But she always tells the people she coaches, "You don't marry a piece of paper. So get off the paper checklist and start paying attention to how you're showing up. If this relationship is bringing out your best and making you feel comfortable and supported and respected, that's really important."