Part of knowing all sides of the person you love is determining whether you've seen them at their best and worst. The beginning of a relationship tends to be the happiest, and there's a feeling that your relationship is almost invincible to sadness. But the truth is, everyone has tough times, and you deserve to be confident in how you'll overcome these moments together. "When things get tough, they may not deal with that situation in a way you'd be comfortable with," says Stollman. It's better to know this before getting married so you can address your problem-solving issues.