Does happiness matter in a relationship? I think it does, but we may need to understand what it is in the first place? Happiness relates with positive emotions which people experience when satisfied about something and that brings good health. The true happiness relates so much with the framework of your mindset. You will only experience true happiness if you have a positive mindset and it will create positive emotions even out of your negative situations. If it is negative, every time you experience something, you will always create negative emotions out of it and that may cause ill-health for you.