When two people marry, they become one. A united front. Partners in life. In reality, though, they are still two separate people with their own dreams, ideas and personalities. Compromise and communication are a must. Learning to live with the good qualities and the bad are a must as well. In order to keep a marriage intact, both parties need to see their spouse for what they are; who they are. You are both equal partners in marriage, in parenting, in life. You cannot have assumptions about how they feel or what they think or have unrealistic expectations. Each person has feelings and those feelings are real and true and honest. Feelings cannot be dismissed or argued against.
Listen to your spouse. Empathize when possible, sympathize or acknowledge those feelings and work through them. You each need to make concessions, to make an effort to see things from their point of view. Allow your spouse to speak, to get things off their chest, to vent and to speak up about concerns. Respond to them with acknowledgement, with your feelings and concerns as well. Getting defensive and argumentitive when issues come up only result in arguments or full blown fights.
Remember that when you both said I do it meant we are in this together no matter what. Issues will come up. Fights will happen. But remind yourself of the love that brought you together, of the promise you made to each other and of the commitment you made. See your spouse as a human with emotions and feelings and faults and accept that. Embrace your spouse, be there for your spouse and they will be there for you.