I've been married 41 years and what works for us, is to let each other have their space and time to do things with their own friends and not get mad. Also spend time together doing what the 2 of you like to do. Remember to LOVE that special person.
Always remember your hardest job is making a good marriage last. 2nd hardest job is raising your children. 3rd hardest job is the one you got paid for doing.