Having spent the last 26 years, blissfully married to my wife, the only advice I can give you is to learn a new language. It's a very easy language to learn. It's called wifeese. The entire vocabulary for this language is just 2 words.
Yes Dear.
But on a serious note. Always say you love her (and mean it). Never go to bed mad. Always remember she's the best thing that's ever came into your life (well other than the pied ball python). Hold her hand. Last but not least, look into her eyes at least once a day and realize what you're seeing. You Soulmate.