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A lot of things will change in being together for a long time. They said the number of years of being together is not an assurance that you will last. People will change. Feelings will change.
Dreaming of a happy "marriage" is not easy to achieve. You will invest a lot of hard works, sacrifices, patience and choice. Communication plays a big role in this. Listening to both sides and express how you feel to each other. Be open to him/ her. Talk your problem. Don not turn your way to each other especially if one is angry.
Happy marriage is not all about happiness, sometimes it's only part of it. You're filling those spaces without noticing those small things that cause it. Being married is not a duty, its a full commitment to your partner who you shared your undying vows in front of God. Lucky to those married couples who still cherished and keep their wedding vows, no matter how difficult the situation is. No one will just fall out of love in just a snap without feeling unwanted.
Yes, there will never be perfect relationship. Not all good things bound to last. But its up to us how we will choose our move to fight for someone you love. Just because something has changed doesn't mean you will have it change you. And if that person loves you, he will hold the future being with you.