One of the big ones for me is communication. This is huge in a relationship. Understanding each other and listening helps both sides of a relationship.
Another one, trust. I should be able to trust that person (hopefully) without a doubt. Unfourtenly, every relationship comes with doubt.
You will doubt something or someone in the relationship, but that doesn't mean you end it. That's why communication is so important. Being able to talk through thease things, and work on trust and lack of doubt makes any relationship strong.
