How can you improve your relationship?

Well said 'listen to your partner'. Be friends, do things you both like, be loving and don't have that headache too often. Appreciate what your partner does for you & you for him. Be loyal & grateful.

Sometimes it is best to let a relationship spiral off into the sunset, as mine did twelve years ago after being together for thirty two years. People change, not everyone will stay the distance.
If I was to give any advice, it would be stay away from things like relationship checkers or tests and talk to each other, then keep on talking until you reach a compromise.

Make sure you listen to each other's point of view (even though I am always right) and ensure you have time for yourselves for your own interests.

Make time for each other and be a couple.

Ooh I don't think I want to go near the relationship checker!

Cultivate a sense of humour I would say. I remember watching an interview with Hilary Clinton once, and the interviewer rather boldly asked her how her and Bill got over the Monica event, and she replied "One day, he did something that made me laugh, and the next thing we were talking again".

Walk faster would be perfect advice for us, OH likes to stroll real slow and I prefer a fast walking pace , something we've never solved. Love to have a nice long beach walk no matter the weather..