You trust each other
It's a big deal if someone puts enough trust in you to devote time to you and open up to you. If you're going to be with them for a long time, it's important that you show reverence and respect that bond.
"It is difficult to be vulnerable and share problems with others," said Hershenson. "When a partner is able to open up to you it is important to not break their trust."
In a relationship, trust is everything. If you feel comfortable and confident that your partner won't do things to hurt you and is not going to cheat on you, then you may have a winning team.
[Photo via @gigihadid]