If they have a problem with their spouse then they talk to him or her about it or they talk to a trusted confidante. And when they talk about their marriage problems they do so without blaming their spouse. They take responsibility for their part in a problem and own up to their reactions as being under their control. Respond to your spouse's needs. What's important to your spouse is probably different than what's important to you.
People feel loved in different ways.
Sharing feelings, being appreciated, special time together, affection, sex, thoughtful gifts, and shared activities are a few examples. Know your spouse's love language and be sure to use it often. Express interest in what's important to your spouse. Talk to your spouse about the things that interest him or her. This tip may be last in the list, but it's certainly not the least important.