Practice gratitude
Rita Watson put together a study involving 77 married heterosexual and monogamous couples and got them to do one thing: express gratitude to one another. What she found was the participants who did this on a regular basis had stronger relationships. They reported to be more peaceful, amused, and proud. It also leads to people being more responsive, understanding, and validating.
Keep to a 3:1 ratio
There are several ratios revolving relationships floating around that you can use but they all have a similar theme. For every negative interaction or experience, make sure there are way more positive experiences. That can be 3, or even 10. Regardless, ensuring that more positive interactions can ensure that a relationship flourishes more.
Keep the novelty around
As you spend time together the more you’re going to learn about one another. At this point, the novelty can begin to slip away and relationships can start to slip off. The reason is simple: we love novelty. So one good way to keep novelty around and alive is to be doing new things together.