If there is one truth I have deduced from the marriages of my buddies and acquaintances, it is the fact that marriage is very much like life. It is full of ups and downs. As a single individual, there are highs and lows; there are moody days, and there are upbeat days. There are days when you decide to drop a bad habit, and there are days when you decide to take up a new hobby. The point here is, as a single individual, you are prone to a lot of changes, because it's a human norm. Getting married does not stop change; and truly, there is nothing wrong with changing. Sometimes change is a sign of growth, and you can't stop growing simply because you are married. The problem is when you start growing without carrying your partner along.
We all have our tendencies when we are undergoing change. Some people sit with their partners and discuss the possibility of change; some people simply change and expect their spouses to catch up, while others change and could not care less about their spouses catching up or not as long as they are happy. This results in a disconnect amongst spouses, and if not addressed as soon as possible, can lead to spouses growing completely apart, and separating due to irreconcilable differences. It is important to audit your relationship frequently to ensure you are connecting with your spouse spiritually, emotionally, financially, intellectually and spiritually. If you are not connecting in an area or some areas, then you have to take steps to seal the gaps.